drop of a hat Share definition Flag An idiom meaning to happen quickly, easily. For example, in the amount of time it would take a hat to fall to the ground. When I'm thirsty, I could suck down a beer at the drop of a hat. drop of a hat by Marquismarque April 28, 2008 0 0 Get merch Get the drop of a hat mug. Buy Now — $32.95 See more merch