half a slut Share definition Flag Half a slut is a girl who sleeps around but only allows oral (and sometimes anal) while saving the vagina for her husband/boyfriend. Amy's only half a slut because Tom's the only one that's been in her vagina. half a slut by Floackle March 3, 2008 0 0 Get merch Get the half a slut mug. Buy Now — $32.95 See more merch