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A Facebook Wingman is a guy who posts pictures of his friend's ex while pretending to be the ex. He'll either talk up his bro like he's a god or act like a complete idiot to make him look good. He's not cool, but he gets the job done, especially when he's drunk.
I posted a selfie with your ex and said you're a loser. #winning
Your ex just messaged me. I told her you're still single. #lowkey
I called your ex a bimbo in the comments. You're welcome.