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1.
A phrase that represents ones complete and total disregard of another's negative comment towards the original person.
*Guy 1 is walking down the street and passes Guy 2*

Guy 2: Why are you so ugly?

Guy 1: Haters Gonna Hate. *Keeps on walking*

Dude 1: Hey Fatty!

Dude 2: Haters Gonna Hate
by WhyDoesUKGottaHateOnTheUS? August 19, 2010
 
2.
A phrase used to acknowledge individual superiority in the face of negative external accusations. Can be repeated twice for emphasis. Often accompanied by a strutting walk away from offending party.
Robert: "Lisa called you a whore."

James: "Haters gonna hate, man. Haters gonna hate."
by oshep October 15, 2010
 
3.
A colloquial saying. It means that people who don't like you will always find a reason to dislike you, no matter how stupid that reason may be.
"Dad, Jane says she doesn't like me because I write my math problems in pen!"

"Don't let it get you down son. Haters gonna hate."
by Unholyhair January 28, 2012
 
4.
Dissenters will inevitably abhor
Ghetto Person #1: "You're a whore!"

(Said to Ghetto Person #2)

Ghetto Person #2: "Haters gonna hate..."

Normal Person: (over hearing this exchange) "What does "Haters gonna hate mean?""

Ebonics Translator: "I believe the presumed whore meant to say, dissenters will inevitably abhor or put simpler, hateful people will be hateful."
by emf82 April 21, 2011
 
5.
Usually used as a comeback at a person who expresses an opinion that the user of the phrase disagrees with and/or feel personally offended by, often for completely irrational reasons.

If it used in real life, it is often accompanied by that person strutting away as if they had just destroyed you with witty and rational arguments.

This phrase is rarely used by anybody above the age of 15 and with an IQ above 95.
Example 1:
Moron: The new Eminem album is soooo awesome.
Normal Person: I disagree...his older albums were way better.
Moron: Pffft...HATERS GONNA HATE!

Example 2:
Moron: My new shoes look awesome, don't you think?
Normal person: Meh...they're not really my taste.
Moron: Ah, whateva. Haters gonna hate (walks away as if she/he just said something extremely clever and original)
by kabu3000 December 14, 2011
 
6.
Stated by Dave Chappelle portraying R. Kelley in the music video "Piss on you"
Haters gonna hate, lovers gonna love. I don't even want none of the above. I want to piss on you.
by GeeMonee March 02, 2012
 
7.
A phrase used to express apathy towards another's disapproval. Probably one of the most overused and annoying phrases of the year 2011 and will be for 2012. Although it has reason behind it in most cases (mainly when it really is only a matter of opinion) in some cases it does not (when reason comes into play).
An acceptable use of the phrase:

Sam: You look weird as a brunette.

Sandy: Haters gonna hate.

An unacceptable use of the phrase:

Sam: Justin Bieber can't sing and looks like a 12 year old girl.

Sandy: Haters gonna hate.
by mainlyachocolatepinecone February 05, 2012