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1. girlfriend-in-law
term used for a "good" female friend who is closely related (e.g. sister, best friend, roommate) to your girlfriend
Dude, you're dating Lindsay but I saw you face-sucking with Britney.

It's cool -- Brit's my girlfriend-in-law -- that gives me special privileges!

If you can convince Lilo of that, you are my new god!
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