mongtard Share definition Flag A combination of "Mong", (meaning a total idiot) and "Retard". General useage as an insult. 1) You're a total mongtard! 2) What a mongtard! mongtard by SpasmicPuppy January 19, 2004 0 0 Get merch Get the mongtard mug. Buy Now — $32.95 See more merch