Fap Butter Share definition Flag (See fap.) AKA Vaseline. Every good fap needs some quality fap butter. Tim: Man, I wanted to fap tonight but I ran out of fap butter. I sent my mom out to the store to go get some. Fap Butter by Pickles McSimpson January 14, 2013 0 0 Get merch Get the Fap Butter mug. Buy Now — $32.95 See more merch