dickplegm Share definition Flag Someone so stupid, they are classed as dickphlegm, because people will be hard pressed to find something more stupid than that, and is just used as a rude term. I hate Ben, he's dickphlegm. dickplegm by Nimbus April 25, 2005 0 0 Get merch Get the dickplegm mug. Buy Now — $32.95 See more merch