The act of writing on someone's facebookwall after 1pm in hopes to start a convo that leads to sex. Worse than sex texting, as everyone else sees your pathetic attempt.
Guy 1: All my booty calls went unanswered last night.
Guy 2: Dude, its 2008, it's all about the booty wall.
To solicit sexual activity through facebookwall posts. Like a "booty call," it occurs without warning. The person soliciting sexual activity usually implies that their place is available for the other to stay anytime (for casual sex).
This guy that I haven't seen for ages just bootywalled me on facebook!