kid selfish Share definition Flag In a state of being selfish and/or hardheaded; one-track minded; ungrateful. Until you stop being kid selfish about my money, I'm taking your cell phone for collateral. kid selfish by Mr. Terrence L. Trezvant October 2, 2006 0 0 Get merch Get the kid selfish mug. Buy Now — $32.95 See more merch