An issue within a relationship that constitutes one partner breaking up with the other. Note that they do not need to be a "good" reason by society's standards, but are specific and individual to each relationship.
I can't believe he broke up with her because she didn't put out after 10 dates. I guess to him, that was a "deal breaker".
by CGH May 01, 2006
Top Definition
A deal breaker is ‘the catch’ that a particular individual cannot overlook and ultimately outweighs any redeeming quality the individual may possess.

The deal breaker was that he was married with kids and I don't condone adultery.
by Irish Red August 24, 2006
Some aspect of a deal you make with another person (could be anything from a job offer to a relationship) that prevents you from being able to do it.

When you're facing a situation where there are catches to something, the deal breaker is that one catch that you cannot overlook and/or tolerate.
After looking at this job offer, I could tolerate the lousy shifts, poor pay and even the job being not that great. Having to put up with a two hour drive two and from work every day? Sorry but that's the deal breaker.
by Optimist with experience September 11, 2008
A term popularized by Liz Lemon from 30 rock which is used to describe the event which led to a breakup with someone or something (ie. Brand loyalty)
"What happen, did the relationship suck?"
"Dealbreaker. She wanted to have sex in a Coffin"
(From the TV show castle)

"I loved Microsoft, but Windows Vista was the dealbreaker for me.
by stupidpower December 01, 2009
Children. Single folks, you know what I'm talking about.
No, no, you're really sweet, but I didn't know you had six kids. That's a total dealbreaker. Sorry.
by AmbroseKalifornia March 14, 2008
A word used to describe the eligibility of a friendship or relationship based on one trait or preference of the other person. Can also be used if you don't agree with someones views.
John: "So whats your least favorite band?"
Jill: " It would have to be Arcade Fire."
John: "Wait...What? You don't like Arcade Fire? Thats a dealbreaker."
Billy: "Favorite Modern Warfare 2 class?"
Johny: "Well, I usually have the UMP .45 with a Silencer, Desert Eagle with a Tac knife, Marathon Pro, Lightweight Pro, and Commando Pro.
Billy: "Woah man. Way to be a noob. We aren't friends anymore, thats a dealbreaker."
by Pandabrother September 08, 2010
A person, or persons, whose presence at an event can be a determining factor as to whether or not you attend because the person's participation in the event would greatly diminish its enjoyability.
Vyatt: "Hey, some of us are getting together for a little outing, you in?"

Me: "Who's going?"

Vyatt: "Me, Barack, John, Hillary, Dennis..."

Me:"Hillay's a deal-breaker.."

Vyatt: "What?"

Me: "You know, something came up at work..."
by JakeBry March 28, 2008
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