Upfucker Share definition Flag Someone who is fucking anally while the one being fucked is standing. "You wanna upfuck tonight?" "Yeah, sure""You are such an upfucker!" "I don't do it like that." Upfucker by fuckkk October 21, 2013 0 0 Get merch Get the Upfucker mug. Buy Now — $32.95 See more merch