A term used by hard-core wiggers to denote the question, "what?". Its is very embarassing to stand next to some one while they are saying this phrase and it is best to dissociate your self by saying loud and clear that you are not with "him/her".
It drives me nuts when Matt says wiga wiga wha every time he doesn't understand what I'm saying. Hes such a wigger. (But so cute.)