Mocking Facebook Users' posts that are intended to be serious. Usually applied to users who continuously post self-absorbed messages or seek attention or pity.
FB User: Ugh. I'm getting a migraine again.

Facemocking reply: Maybe you should pull yourself away from your computer for 5 minutes.

OR

Facemocking reply: Are you sure it's not vaginitis?
by Shinebert August 24, 2010
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