monkeylump Share definition Flag A bulbous sore that appears between the penis and testicles of a man (taint) when not washed properly. "Dude, can you take me to the doctor? I got this huge monkeylump after camping last week." monkeylump by Rockdiamond December 31, 2011 0 0 Get merch Get the monkeylump mug. Buy Now — $32.95 See more merch