Smelly Helmet Share definition Flag The act of pooing on a girl's head and then smushing it down with a stylish hat. Allie Carpenter was annoying as shit so I threw her a Smelly Helmet real quick. She doesn't bother me anymore Smelly Helmet by GhostPoop February 20, 2011 0 0 Get merch Get the Smelly Helmet mug. Buy Now — $32.95 See more merch