Some funny, loud way of getting a friend's attention, especially in a busy place like a classroom, hallway, store, etc. Add emphasis on the "Yeah"s and say the person's name like a question. It's meant to be really loud and almost sarcastic.
This term was created by Dr.Singer who in moving from the east coast to the midwest was rather interested by the hillbillies which inhabited the local area, and therefore created this amusing slang term.
are you gonna skip class tomorrow?
i can't, i have a midterm.
oh yeah, huh. ok.
jim: i don't really think that Rousseau is trying to represent the people in his theory of social contract.
bob: what are you talking about? he's the one who defines the general will!
jim: oh yeah, huh...