Gillywomp Share definition Flag Gillywomp or gillywompus is a term used to describe a person who is trashy or just plain stupid. You gillywompus prick!You’re such a Gillywomp! Gillywomp by Someone better than Casie duh March 27, 2024 0 0 Get merch Get the Gillywomp mug. Buy Now — $32.95 See more merch