Sexual encounters via facebook. Esp. if on a regular basis between the same people. This is done through private messages, facebook chat, or wall posts.
"I was up all night facebonking **** he sure knows how to please a woman!"

"Yeah I've been facebonking this girl for a while now, the other night we were chatting and my Mum walked in on us, it was so embarassing."
by Lyd8 May 4, 2011
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A common misspelling of Facebook. It occured to me that this is a effin' funny word and obviously a reference to being shagged in the face whilst giving oral
"I want to Facebonk your face"

"She was rubbish at head so i just Facebonked her"
by Sneeky Dave again September 29, 2009
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Someone who is constantly going crazy on Facebook...
By crazy I mean... commenting on every single photo, writing on everyone's wall, groups, invites, etc. etc.
"Dude.. Freakin Kathy has gone completely facebonkers!...."
"Yeah, man... She left me like 16 photo comments and invited me to 4 groups and all this shit"
"God help us..."
by Klyde Frog January 28, 2009
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A term for oral sex that is generally more acceptable in polite conversation than skull fucking

Derived from a typo of facebook
"I was facebonking when her Father walked in."

After facebonking each other for a while, Jennie and Tom decided it was time to change their relationship status.
by Rainbulimic July 11, 2008
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