BIAH!!!!!! Share definition Flag biah--- short for bitch , term used in middle grade schools ____--shout* BIAH!!!!!!*--___ or your a BIAH, no gettin in trouble by teachers they dont understand BIAH!!!!!! by soccerchic November 9, 2007 0 0 Get merch Get the BIAH!!!!!! mug. Buy Now — $32.95 See more merch