Top Definition
Making plans to hang out with someone you didn’t really like but had sex with on a first date, in an attempt to retroactively render yourself less of a slut/player.
"Yeah, we did it on the first date. But we’ve been backdating, so I can still say I’ve never slept with anyone I went out with less than three times … "
by aboredlawyer July 10, 2008
1 more definition
When you date your ex out of desperation, boredom, guilt, or displaced regret.
I thought you and Cindy broke up a long time ago.

Yeah, we're just backdating.

Oh, cool, that sounds like a healthy life decision.
by UrbanLexicologist April 06, 2010

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