slap twat Share definition Flag someone who plays bass guitar and shows off by constantly playing slap pop wtf this kid thinks hes solid because he can play slap pop. what a slap twat, lets see how good he is when i slap his ass and pop a cap in his ass. slap twat by mr ess February 21, 2009 0 0 Get merch Get the slap twat mug. Buy Now — $32.95 See more merch