Negative Penis Share definition Flag when someones penis is so small that it comes out their asshole. Commonly used as an insult. Bob: Hey markm, your penis is so small, you've got a negative penis going on! Mark: Shut the hell up Bob Negative Penis by Zakk May 17, 2003 0 0 Get merch Get the Negative Penis mug. Buy Now — $32.95 See more merch