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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
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Apr 15 Word of the Day
to take an unfortunate loss and turn of events.
"last night took an L, but tonight I bounce back" - Big Sean (2017)
via giphy
by urbansammy January 20, 2017
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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
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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
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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
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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
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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
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