A word used by stupid people. Roughly translated it means:
"What you just said reflected badly on me/somebody that I like and I have no argument whatsoever to defend them. This, however, will not stop me from trying."
"Hey Hitler, what the fuck is this Genocide all about? You sick cunt!"
"Hey man, you're just a hater!"
"Chris Brown is a woman beater!"
"Hey, his music is great! You're just a hater!"