barse UK /bɑːs/US /bɑɹs/ noun2 •(slang, vulgar) The perineum of a man.The padding is also way too thin and I'm constantly aware of the pressure on my barse (I think perinium^([sic]) is the correct term) - something I don't have with my other shorts or tights. — 2002 •The perch; any of various marine and freshwater fish resembling the perch. formsbarses