A word used by the common herd(idiots) who can not think of any other way of defending something questionable(idiotic). Hater is commonly used against fellow humans that have their own opinion differing from the words user's opinion or the common herd's.
Me: "That primer grey yugo with the shopping cart wing is ridiculous."
Idiot: "DUDE!!!! y r u alys h8in on dis ride??? Your Gust a J3alous hater!!!