What is Replacebook?
1.
The act of replacing someone's status to something stupid when they make the schoolboy error of leaving it open around stupid friends.
Person #1: 'Joe Bloggs is looking forward to the weekend'
(leaves the room with facebook logged in)
Person #2: (changes status to) 'Joe Bloggs wants you inside him'
Person #1: (comes back into room and sees smiling friends, instantly gets a sinking feeling) 'I just got replacebooked didn't i?'
See