obnoxtard Share definition Flag A person age 13 or over who is loud and stupid and often has no idea what they're railing about or what they're getting themselves into. "Josh is not an obnoxtard because he knows what he's talking about!" obnoxtard by Corridor March 26, 2010 0 0 Get merch Get the obnoxtard mug. Buy Now — $32.95 See more merch