What is Buncy?
butt, rear-end, backside, ass
Friend 1: Dude, check out that girl dancing.
Friend 2: Yea, nice buncy on that one.
OR
Friend 1: Dude, I can't believe John stole your girl.
Friend 2: Yea, bro, that kid had better watch his buncy.
See ass, rear, butt, backside, trunk