Booshing it up Share definition Flag Its when a guy goes down on a girl who doesn't go down on him in return. Brandon is such an ass, he is always Booshing it up and the bitch never sucks him off. Booshing it up by Otis Mildred January 7, 2006 0 0 Get merch Get the Booshing it up mug. Buy Now — $32.95 See more merch