look up any word, like half chub:
 
1.
v. To unfriend (or block) someone on Facebook (or any similar social networking service)
"Dude, I can't believe that girl. I sent her an invite to my bondage workshop and she Facebucked me!"

"If you tag one more photo of me, I will Facebuck your ass!"

"Sweety, I know I slept with your brother and your best friend at the same time, but do I really deserve a Facebucking?"
by Montana Jack November 18, 2009
 
2.
to be drunk, inebriated, intoxicated, or shammered while facebooking.

often results in ridiculous and/or shameful posts one would not make whilst sober.

can be a verb as well.
" i was soo facebuck last night.. i dont know why i wrote one insert ex's name here's wall.

"holy shiet daria, your are all over my news feed" "ya i facebucked last night'
by Ninja Shit January 26, 2011
 
3.
Virtual money that is used in the on-line community, facebook.com
I won 2,000 facebucks last night playing Texas Hold 'Em.
by daybedoe July 17, 2008
 
4.
To pass the buck on moral or social responsibility and/or action for an issue/cause by re-posting the link about the issue/cause to your own Facebook profile, instead of taking the action requested by the post.
"Ugh, I don't really have time to sign this 'feed the polar bears' petition. I'm gonna Facebuck this one to my friends."
by MissGodiva February 04, 2013