Flabbershmonker Share definition Flag (Noun) The most annoying person you know; (Exclamation/informal) The swear word above all cuss words (Noun) "My swim coach is a real flabbershmonker."; (Exclamation) "Holy flabbershmonker!" Flabbershmonker by Donutpearphone June 15, 2016 Get the Flabbershmonker mug.