Mistletoe Monday Share definition Flag The day in which everyone wants to kill Justin Beiber. Joe-"Hey, John! it's mistletoe monday, guess what that means!"John-"It's beiber huntin' time!" Mistletoe Monday by AMERICA F*** YEAH October 17, 2011 0 0 Get merch Get the Mistletoe Monday mug. Buy Now — $32.95 See more merch