tight as a gnat’s twat Share definition Flag not generous and does not like spending money,miserly,mean He was tight as a gnat’s twat that he counted every biscuit in the tin! tight as a gnat’s twat by Mehrdad.Hosseiny January 26, 2009 0 0 Get merch Get the tight as a gnat’s twat mug. Buy Now — $32.95 See more merch