hmay Share definition Flag an acronym for the phrase "how mad are you?" used to find out the extent of someones anger in an aggrivating situation. Pronounced h-may. person 1: "oh shit, someone stole my weed!" person 2:"hmay?" hmay by Mohammed Abdul Jabar November 4, 2010 0 0 Get merch Get the hmay mug. Buy Now — $32.95 See more merch