skinflint Share definition Flag An unreasonably thrifty person. (Flint is a semiprecious mineral a relative of quartz, and the notion that the greediest person would keep flint shavings for economy). My uncle George will never help anyone out. He's too much of a skin skinflint by Anonymous August 13, 2003 0 0 Get merch Get the skinflint mug. Buy Now — $32.95 See more merch