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2.
Infiltrating someone's electronic communication account, such as email or facebook, and sending out erroneous and usually embarrassing content for said user
After my sister left her laptop on and her Facebook account up, I facepunked her status to imply she suffered from herpes.
by vaughn2974 July 13, 2010
 
1.
A process invented by Sean Kirkland that uses Facebook to prank people.
Dang, I just got facepunked when Sean sent a message to all my friends telling them to post knock-knock jokes on my wall. I got like 200!
by falophal July 27, 2009