gumpy Share definition Flag (n.) A slur directed towards people with ginger hair. Derogatory. Jason: told you "thomas dont dye your hair red it gon turn out sillier than a goose with a cracker in its beak" but you didnt listen and now you look like a damn gumpy! gumpy by tommyneedsfriends January 21, 2022 Get the gumpy mug.