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A faceboo is someone you have an online relationship with. You'll probably never meet your faceboo in person, especially if he or she lives in another state or even another country, but you still flirt on various social media.
So when you gonna hook up with that girl you keep chattin with?
Chill, son - she just my faceboo.
faceboo by alteregalitarian June 26, 2010
Yo, you know those friends on Facebook, friends of friends, people you don't know, but they always be likin yo posts, sending Happy Birthday or commenting on yo club pics? They yo faceboos. You have ya bros, ya hos, ya boos, ya cuz and ya faceboos.
Babe, why ya gotta be so jealous! Quit trippin! She's just my faceboo!
faceboo by Jamesknapper June 4, 2013
-verb (transitive)
1. To come from seemingly nowhere and contact another on Facebook®.

-noun
2. The item received when one Faceboos you.
Ex 1(verb): Tracy Just commented on my status. Where the %$#@ did she come from? She totally Faceboo'd me.

Ex 2(Noun): I just got a Faceboo from Jenny. I forgot all about that whore. Wonder who she's banging now?!
Faceboo by JeremyIsAwesome February 22, 2011
A Faceboo is simply your boo (lover, boyfrend, girlfriend) that you met on Facebook first.
John: So mike how did you and Kate meet
Mike: Oh! She's my Faceboo
Faceboo by Tale07_cro February 3, 2010
Someone who you are friends with on Facebook.
"I can't remember, have I added you as my faceboo?"
faceboo by zeppelina_ever March 11, 2008

Faceboo-hooer 

A Facebook whiner. Someone whose Facebook status updates constantly refer to a state of sadness, despair or gloom.
Oh, God, Rachel and Ronnie are SUCH Faceboo-hooers.

Ex:
Rachel is: "feeling a bit blue today..."
Ronnie is: "hoping things will look up for him soon."
Faceboo-hooer by VinnieVin February 3, 2010