Actually, it's grammatically correct like that OTL.
It's proper to put a comma after 'yeah.'
For example: Yeah, I just bought a new CD.
It's proper to put a comma after 'well.'
For example: Well, I just bought a new CD.
It's proper to put a comma before and after 'like.'
For example: I just, like, bought a new CD.
It's proper to put a comma before 'man.'
For example: I just bought a new CD, man.
All together, it becomes:
"Yeah, well, that's just, like, your opinion, man."