Is “buckets of crazy” a common expression?

supernatural? Dean has his vocabulary

Not really. Maybe it's something on this TV show. Are you working on a fan fic, or just reading one?

Not especially, but “buckets-o’-anything” is easily understood to be a lot of that thing. So he means here that the girl was especially crazy.

Not common at all, have literally never heard that. But buckets of anything can be understood to mean lots of it. Though I've never heard or seen this I understand the meaning.

Not where I’m from no.

"Buckets of crazy" is not a common expression. However, when you have "buckets of something" you have a lot of that something. This phrasing would be well understood where I live. > Can I borrow a pencil? > > Man, I've got buckets of pencils! Take as many as you want. But the original post is not using "buckets of ___" in that way. They're using it as an intensifier, in the same way someone might use f***ing or heckn'. (You can tell because if you remove "buckets of," the meaning of the sentence doesn't change.) From my experience, this usage is nonstandard and feels awkward, but I understand what it means. So it might be a regional difference, or just for humor.

Not at all, but people will understand what you mean.

No, this is just Supernatural. It's not enjoyed for its realism.

Not common, but a fun way to say someone is crazy. People often come up with off-the-wall ways of saying things in the moment.

First, i love that you are using Supernatural to help learn English. Second, no, it's not a super common expression but would be readily understood. Saying someone is "buckets of fun" is used a lot... though often sarcastically. So turning that phrase around like this makes sense. Plus, it is very "Dean" to mildly pervert phrases like this. His manner of speaking is very casual and sorta redneck by design.

Never heard it, but I love it.

No, but bucketful is a word. Meaning enough to fill a bucket. O' is short for "of." Like ten o' clock. Bucketfuls of crazy, is what he meant. I assume you put all that together already, but I thought I'd spell it out.

No, not common. "Mad as a bucket of frogs" is *somewhat* better known, and often adapted in all kinds of ways. It could be a box of frogs, or a bucket of bananas, etc. So, it's pretty easy to understand.

No. I've never heard this exact expression, but it is still understandable. It's not like it's a weird thing to say, it's just uncommon, any native speaker should understand what you mean and continue on with the conversation.

Buckets of... stuff to mean a lot is used quite often. It can be applied to crazy, but buckets of rain is probably the most common.

No, it’s not common. He’s just making a joke about either the old kids game buckets of fun. Or more likely the one that was played on Bozo the clown on early morning TV and he was making fun of Sam because he’s scared of clowns in the show.