v. Simply pieced together, the onomatopoeic word phap (also spelled fap, that is used to describe the sound made during masturbation) is spliced with the word poop, meaning simply: To masturbate while defecating.
Brian: Oh man bro, I phoop so often that my bathroom consistently smells of dump and cum.
Jacob: What the fuck man, thats nasty.
Jacob: What the fuck man, thats nasty.
by Tcreepz13 January 04, 2011