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1.
Referring to your ex (girlfriend, boyfriend, husband, wife) prior to your current ex (girlfriend, boyfriend, husband, wife). Similar to how Christmas Eve Eve is two days before Christmas.

Can also be extended out indefinitely, ie. ex ex ex would be the ex prior to the ex ex.
Bobby: Who was that?

Ricky: Oh, that's my ex ex. She's a real pain. My ex and I actually still get along.
Por TallGreg 19 de enero de 2010
 
2.
a person whom one has remarried after divorce. An ex ex was one's ex-spouse in the past.
How are you getting on with your ex ex?
Por uttam maharjan 15 de febrero de 2010