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A girlfriend that is a future candidate as one of your bro's wife.
Bro, you have to respect my girlfriend. She's possibly your future bro-in-law!
by xx_KittyKat_xx December 19, 2011
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When your only friends with someone because your gf is their friend.
"Hey man, wanna hit the club tonight?"

"Sure, is tom coming?"

"yeah why?"

"I've been trying to avoid him, he's my bro in law"

"aw that sucks"
via giphy
by Lemon Addict July 29, 2017
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