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v. To send someone an inbox message on Facebook. Meant to help you stop sounding stupid, like while telling someone to 'inbox' you or 'Facebook message' you, in which case they will invariably use the shitty Facebook Chat instead.
"Hey, send me that link on Facebook."
*recieves link via Chat, subsequently causing the entire browser to close and all hell to generally break loose*
"NO you asshat, facebox me!"
facebox by kkkitty April 14, 2009
when you go hunting for box on facebook
i 'facebox'ed your mum last night
facebox by faceboxer November 26, 2010
Giving a politically-charged status update on Facebook.
"Boy, Mary was really up on her Facebox about healthcare reform."
Facebox by Mrs. Fletch February 3, 2010
when someone sends you an inbox message on facebook
if you want to say something personal to me dont put it on my wall Facebox me
FACEBOX by sugarcrash December 14, 2010

facebox-360 

someone hitting themselves(1) or others(2) in the face with an xbox 360
(1)"DUDE! GENE SIMMONS JUST FACEBOX-360'D HIMSELF!"
(2)"DUDE! LADY GAGA JUST FACEBOX-360'D JUSTIN BIEBER!"

Facebook your ass

When a hurt, spiteful person posts something personal, private and intimate about another person where that person will in turn feel betrayed, embarrassed, hurt, or even criminally prosecuted.
She told John she wanted to be with him for the rest of her life, then she changed her mind. John didn't take too kindly with her decision. He told her, "Bitch, I'll Facebook your ass, so he Facebooked her ass and posted her brazenly bragging about all of her recent misdeeds
Facebook your ass by Nikki Stixx October 12, 2019