h-tard
Short for Holi-Tard. A dumb person who thinks they're the best at everything and acts like they're from another planet.
"You call that a Holi-Tard? I've seen smarter people at the dog park.", @SmartGuy45
"My friend is a Holi-Tard. He thinks he can beat me at chess with a stick.", @ChampionChess
"I tried to explain what a Holi-Tard is. He just said 'I don't need no stinkin' explanation.'", @DumbFriend69