Is this actually "old-fashioned" as the Cambridge dictionary says? What would you do if you heard someone using it or read it on the web? Especially British people :)

I'm American, and I've never heard or seen it used before. I'm sure I would understand it in context though. It does sound British to me.

If under 65 or so, and a middle class RP speaker, I would think the person likes talking as if they were a caricature aristocrat, and is doing this consciously. Almost certainly a fan of PG Wodehouse, the Mitfords, Brideshead Revisited and that sort of thing. If from an actual aristocratic family, they might be fond of the phrase because it reminds them of parents or grandparents.

It is absolutely old-fashioned. I would not expect to hear it anywhere but a period drama, or a very old film.

American, yes it's old fashioned but I might say it in a joking manner. If someone said it I would think they were being silly.

Canadian, I've heard it a few times but always ironically.

If I heard the words pish posh - I would think I was in a dream, or in a movie, or in a sitcom, that someone was trying to be funny or maybe that I had time traveled. I hear it frequently, but always has some sort of joke.

I suspect this hasn't been in regular usage since the 1930s. That's the kind of era I'd expect to hear it used in. Literally no-one in this day and age uses it. I'd also say it seems like the kind of thing I'd expect to hear from an upper class speaker. It doesn't seem like the sort of thing a working class or even middle class person would be likely to use much. But that might just be my lack of knowledge of the term. Edit: as an example, it's similar language to what I'd expect to see in Jeeves and Wooster (which was written in the 1930s so the language should hopefully be fairly authentic). As an example, see the video below, starting from about 1 minute 5: [https://youtu.be/WIih5gB6Qcw?si=6GCWFRvwW6Y93blz&t=64](https://youtu.be/WIih5gB6Qcw?si=6GCWFRvwW6Y93blz&t=64)

American here, it sounds like the kind of phrase only used by upper class British people in the 1940s

Bit weird, but I've heard those words before. British person here, Pish Posh has been used around me before.

I've never heard anyone say it, and I've lived in England for decades.

My MIL says pish posh balderdash as an exclamation of frustration, as does my wife occasionally. From the Midwest.

My (American) grandpa used to say that occasionally. He was born in 1917.

It’s definitely old-fashioned, and I don’t think I’ve ever heard it used in person except in a deliberately comical way.

No British person outside of the most old-fashioned aristocracy (or those doing impressions of them) ever says this.

Depends on your definition of old fashioned. I'd say for the most part, if you're under 50 you may not have heard of the saying. I don't think I've heard it in 20 years.

I’d laugh. It’s *really* old fashioned, and I’m not sure it was ever widely in use in America. It sounds like something you’d hear on British television. I’ve known people born in the 19th century and I’ve never heard anyone say that in real life.

As an American, I have only ever heard “pish-posh” used in caricatures of old-timey British people.

Never heard this

Never heard it used in England.

As a Brit living in the USA, the only time I've ever heard this is when someone is trying to mimic a British accent for comedic effect.

Very old fashioned and I have only ever used it for humor or irony

very very old fashioned. source: 59 and have read widely from the generation before mine.

If you say this, I'm going to assume that you're wearing a top hat and monocle.

I'd say anyone who talks like that in this day and age has a piss poor grasp on the modern use of language and phrasing, they are a relic of Victorian times

USA English speaker here- this is very recognizable and easy to understand. It does sound old fashioned and I don't hear it often, but people may say it on occasion in a joking way. Absolutely nobody ever says "poppycock" though. :p

It is old fashioned so would only be said in a joking way. i used to have a teacher who said “balderdash” which means the same thing. Still think about it and that was 40 years ago, and never heard it said by anyone else.

Yes it’s old fashioned, yes people still say it. Is it commonly used? No. (UK)

I definitely agree that it's old-fashioned. As an American, it strikes me as something you'd her in a parody of a British accent.

If i heard someone speaking that phrase I would assume they either just watched a period drama or that they're making light of their interlocutor 's outdated opinion.

it’s absolutely old fashioned but say it anyway if you want fun reactions from people

I’ve heard it mostly used in a full phrase of “pish-posh applesauce” to convey the same meaning, but have heard it in nearly 20 years. I’ve also heard my mum and aunt use pish posh by itself, probably older family members too. Mum & aunt boomer Brits, me millennial Canadian

Yeah, 30s Brit here, it's an old-fashioned posh-ish phrase. My dad would still say this! His dad would've said it unironically. My dad would've started saying it unironically but nowadays it's probably more because he's deliberately putting it on a bit. He's the type of person to naturally say these phrases, but also knows we might tease him about it, so might say it more to make us laugh. Definitely not completely out of use though!

I had never heard anyone use it, checked on [Pish Posh | 12 pronunciations of Pish Posh in English](https://youglish.com/pronounce/pish_posh/english) and they only have about 10 instances of it, when they usually have hundreds of thousands. I'd say that Cambridge are right. Personally, I would have a rather poor opinion of anyone who used it unless it was some kind of joke, and even then I doubt it would make me laugh (unless it was the[ Fast Show](https://www.youtube.com/watch?v=18JmieM8SFc&t=4s&ab_channel=analogmoose))..

British, and I say it all the time (because I swear too much and my son is just the right age to start copying me). Sometimes just “pish”, too. 

Oh pish posh. I still use it.

I am more accustomed to hearing "pish TOSH"

Definitely old fashioned - wouldn’t expect anyone under the age of about 50 to use it.

Ive heard plenty of british say pish posh honestly. At least I think?

If I heard someone using it I'd suspect they're a posh old twat from the 1930s.

While it is definitely old-fashioned, I use it ironically every once in a while.