butt monkey Share definition Flag a term appropriate when someone has upset you by being an idiot. 'Hey. You shouldn't have done that butt monkey!' 'Um, no one says 'She is called.' Butt monkey!!!' butt monkey by apologeticbuttmonkey April 24, 2008 0 0 Get merch Get the butt monkey mug. Buy Now — $32.95 See more merch