What does this “I’m saying like” mean?

\[that's what\] I am saying, like... = That is what I have been saying; we agree. ("like" is used as a filler word)

"I'm saying" means "that's what I'm saying." it's common in some dialects to shorten the phrase, which is basically an agreement. and the "like..." conveys the emotion of the situation. so that's why it's followed with crying emojis here. you could also imagine someone saying "like wtf," or something like that.

maybe ive been reading this comic wrong BUT ive always read this as that character trying to challenge the heterosexual assumption. the setup is that he doesnt have a girlfriend, to which the other person challenges saying “well or a boyfriend, he is bisexual” the first character then takes this as “well dang, nobody is into you at all, you really are a loser, you cant find a man or a woman.” Then the phrase, “im just saying like” is used as a “no im not saying he isnt able to get anybody, im just simply pointing out that he is into men, as well.” it has an exasperated tone of “no you dummy thats not what im saying.” the emojis used after also help convey a sense of playful exasperation or annoyance. its a slang, informal phrase. “like” in this context is common filler word. ive never heard “im saying like” as meaning “thats what im saying,” maybe thats a regional or aave thing and ive always misread this! Edit: changed some wording, couldnt see pic when posting, forgot the wording was that “he is bi”

I feel like this comic was actually written by a non-native English speaker. It doesn't sound natural.

I'm not convinced this is English. 

This is AAVE. Younger generations like to take bits our our language to sound “cool” and due to the internet, it happens faster nowadays

It's AAVE, in other words African American english. You probably won't encounter it outside of America unless its a very young person that is online a lot.

What does "fr" mean in this context?

It's terrible grammar, it's not to be taken as an example of how to write or speak.

Yes, this is common in slang. The thing you’re missing is gesture and body language because it’s a meme. “That’s what I’m saying… like 👀🤭”

"I'm saying like 😭😭" It should also be noted that the phrase doesn't work without the emojis. They complete the sentence and are necessary to understanding its meaning, which in this case is to affirm the previous statement.

The #3 segment of the pic "Nobody want u fr" why did they throw away "s"? To be even more slangy? Or it's like (Does) nobody want u fr? There's no question mark.

I think of it as a sort of unfinished sentence that is probably accompanied by a gesture or facial expression. If the sentence were finished it would probably something like “I’m saying like [how could you have all those options but still no romantic partner?]” The speaker probably feels that the completed sentence is obvious based on the rest of the conversation while also expressing a sort of bafflement at the son’s lack of a partner. The bafflement would also be expressed in the facial expression.

I think this is just a bad meme.

Some people pointing out they've never seen this phrase before kind of confuses me, because I see this style of speech a lot from young people/in AAVE. I think the mother is trying to say "What I'm trying to say is..." but she can't finish her sentence because she's so flustered by how blunt the dad is being she just devolves into crying emojis.