The act of drunkenly communicating with someone indirectly on Facebook, either by posting to a mutual friend's page or updating your status. Typically occurs after fights or break-ups.
Tom: What's up with Kristen's Facebook status? It says "Can't believe how things work out sometimes... Guess some people can never make up their minds."

Jane: She's drunk-facebooking by proxy. She just wants to show Will she thinks their break-up is his fault.

Tom: Is that what she was doing yesterday when her status said something about drinking away her troubles?

Jane: Exactly. You have sure mastered the meaning of drunk-facebooking by proxy
by allegrad July 1, 2009
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When you consistently post graphic pictures and descriptions of your sick or injured kids on Facebook to get attention that you would otherwise not get.
Yet again, Rachel posted a closeup of her kid's bloody nose on Facebook. Her Facebook Munchausen by Proxy is flaring up. I think I'll unfollow.
by AlabamTa October 13, 2017
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When somebody looking over your shoulder tells you to post something on somebody's Facebook page, when you have no desire to leave a message for that person.
Girlfriend: "Hey! Post Happy Birthday" on your nephews Facebook page !"

Me: "I don't even know him. He is my sister's son."

Girlfriend: "Just do it !"

Me: "Yes, m'am-you are a Facebook Proxy."
by The Pirate of Pissants October 29, 2010
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