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(noun) Relationship term used about a person soon to become a former boyfriend or girlfriend. Usually used when a break-up is (or should be) imminent.
- Is that her boyfriend or her ex?
- They haven't broken up yet, so he's her pre-ex.
by Stridspinglan April 11, 2010
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Pre-ex refers to your ex boyfriend/girlfriend before the break up. Many people get confused when someone refers to their ex if they are talking about before or after the break up.

If a person says, "My ex burned my house down" you wouldn't know if the ex boyfriend/girlfriend burned the house down while they were still dating and that's why they broke up or if they broke up and then the ex boyfriend/girlfriend burned the house down.
Bro 1: Bro I made out with my Pre-ex a lot.
Bro 2: Nice, so who you making out with now?

vs

Bro 1: Bro I made out with my ex a lot.
Bro 2: Nice, you getting back together?
by Kentviknesh July 19, 2018
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