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?"