to keep a crush/potential crush in mind for later on when you need a date.
if things don't work out with bob, well, I've always got bill in my back pocket.
also: man, I've had bill back pocketed for years! I cant beleive we finally went out!
or: you can't trust margo, she's always got at least four dudes back pocketed.
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a tactic in flirting, to give the go-ahead for the other person to ask you out via non-verbal cues.
He's come into my work every day this week. I've let him know I'm available and let him know through my across-the-room-staredowns that he's got the green light.
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