bifcin Share definition Flag the hairy, sweaty ahh region between ones ass hole and ball sack. it is not a prerred area to lick. man i've got a sweaty bifcin. its all ichy icky. bifcin by ohh yeeaahh!!! July 24, 2003 0 0 Get merch Get the bifcin mug. Buy Now — $32.95 See more merch