same thing as taint, gooch, etc.
it's the patch of skin between the balls and asshole. girls have one as well but it's not as funny.
it was so hot out my underwear was soaking up all the sweat from my underside.
cum, jizz, sperm, semen, man fluid, man seed, yogurt, penis cream, population pudding, icing on the cake, splooge, baby batter, dong dessert, penial seasoning, man-naise, spunk, cock chowder, what have you
Guy: Ugh yeah you ready for the finish juice girl?
Guy: Too bad! WOP right on the forehead!