look up any word, like wand erection:
 
1.
A person who spends alot of time on the social networking site Facebook. It can also refer to anyone who uses Facebook.
I'm going to tell all my facebums about this.
by m0tive February 18, 2009
14 1
 
2.
rather like a "bum" (fart) but out of your mouth!
did you just "face bum?"
by zoeamy June 20, 2006
9 12