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1.
Sex with an ex-girlfriend/boyfriend, or ex-wife/husband. Also includes breakup sex. Even if no orgasm occurs, it may still count as "exes and o's", because it doesn't matter, had sex.
A: "dude, I hooked up with my ex last night!"
B: "Nice... A little bit of exes and o's, eh?"
by misteroc June 12, 2012