"masturbate" (also the sound of it), slang, by 2001, echoic. Earlier, "drunk" (late 16c.). Related:Fapped;fapping. also from2001 Trends offap Sharefap ‘cite’ https://www.etymonline.com/word/fap Etymology of fap by etymonline Harper, D. (n.d.). Etymology of fap. Online Etymolog...