Bumpy Cake Share definition Flag Bumpy cake is a shaved vagina which has the misfortune to develop razor burn after the pubic hair has been removed. After she shaved her pussy, it became bumpy cake. Bumpy Cake by thelittlestendless July 22, 2011 0 0 Get merch Get the Bumpy Cake mug. Buy Now — $32.95 See more merch