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Another name for any sort of law enforcement, mainly because while you're out minding your business they're always hatin. Whether it's busting your party, or pulling you over on a hotbox session. They get pleasure out of ruining your day, that is unless you need them :\
Yo put out that sweet here come some haters.
by philldafunk November 21, 2007
A word used by people too up their own arses to realise that there might be legitimate reasons to criticise them to describe those that criticise them.
Limp Bizkit's Eightball: Yeah, you a hater, hater, hater
by Clammage June 28, 2009
Someone who is enraged by evidence of another's success and as a result has to try to one up the successful person or simply put the successful person down. Hating is much more than just being jealous of the person who has done well. The hater would find much satisfaction in seeing some form of misfortune come to that person.

Haters may also simply find satisfaction in someone else’s misfortune. When a friend falls off a bicycle and lands in the sewer for instance, it is a normal reaction to laugh at the situation. However, a hater will respond slightly differently by laughing at the person in a ridiculing manner.

Haters have a special link to one another and they tend to fuel each others hate by hating in groups. It may be a form of stress relief or something entirely different but they do seem to become happy from the escalation of hate for a person that arises in these groups.

Haters generally tend to hate people who are doing well even more so - racists excluded - if they are closer or more similar to them or of a similar social class.

When Jesus talked about prophets not being welcome in their own home town, he was probably talking about the haters.

There is one African tribe that used to be famous for hating its best hunters. A great hunter would make the biggest catch in months for instance, and then everybody would put him down by telling him that they couldn’t believe that he could expect them to eat something so puny and unhealthy looking.

However, hating is by no means limited to Africa. Hating exists all around the world. Among travellers for instance, Anglo-saxons from the UK, US and Australia are famous for hating, especially when a non anglo-saxon is doing well. This reputation is likely the result of a handful of haters that make a bad name for every Anglo-saxon, and even citizens of these nations who are not even anglo-saxon.
Sally: "Wow, China and India have been doing really well and a lot of jobs have been relocated due to the super-cheap labour. Are you worried about your job?"
Brian (hater in denial): "We’re in the only country that has quality management skills. Those guys are not smart enough. There’s no way that my job could ever be done by someone outside."

Shawn: "Damn, Kev’s been doing real good these days working his new job. He just got a new car and he paid cash. He’s looking for a house now too."
Wilma (hater): "I don’t believe it. That Kevin is not making that money from a new job. That fool be dealin’."

Peter (hater who is racist but probably doesn’t think so): "No way, mate. Ain’t no way, that this coloured fella goes to Oxford. How many black people go there, like 10? What are the chances?"
by Credit to those who deserve it September 06, 2006
"Hater" is an insult often used by people who are too emotionally attached to a celebrity to accept any criticism of that celebrity no matter how true the criticism is. It is also often used even if the "hater" qualifies their criticism with a positive statement that far outweighs any negative statement made. To call someone a "hater" is an implicit accusation of jealousy, bitterness, and (in some cases) racism. In situations where the "hater" is actually more financially, academically, or socially successful than the accuser, the irony of that fact will always fly over the accuser's head.
Example 1:

A Miami Heat fan: "Steve Nash is one of the best point guards to ever play the game of basketball, but I think that Shaquille O'Neal deserved the 2005 Most Valuable Player award more than Nash."

A Phoenix Suns fan: "You're just a hater".

Example 2:

Me: "Eminem is possibly the best white rapper to ever live, but he is not the greatest rapper of all time."

An Eminem fan: "Shut the #@!$ up, hater."
by Sue D. Nym XVI June 09, 2011
They gonna hate.
Haters: Slayer sucks
One hater has a Slayer CD.

Moral: Haters gonna hate
by Spuh-am Man, the guy awesome December 23, 2010
A premeditated or spontaneous act of an individual or group thereof, who endeavors to keeps another individual (usually African American) from achieving his or her full potential in their chosen field of excellence. The act usually takes a blasphemous or ridiculing verbal form but holds the potential to escalate into a physical altercation; i.e. fisticuffs or cap busting. The propagation and proliferation of such hate has become a pandemic in African American culture. Said hate can apply to all facets of the game; i.e. ones chosen mode of transportation, one’s ability to engage in intercourse (with hoes and/or bitches), ones financial resources, or ones felonious enterprises. Haters frequently resort to such colloquialisms in order to further degrade the moral of the hatee. Constituents of the hater nation usually travel in numbers, in order to exponentially compound such distaste.
Tyrone, upon hearing of Malik’s repeated reception of felatious acts by the sensuously shaped Shaniqua, exhibited his characteristic qualities of a hater by entering into a tirade detailing Malik’s inadequacies of his reproductive organs.
by The Alpha Hater July 13, 2009
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!"
by iresheen July 06, 2012