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1. booking up
The act of meeting a girl and instead of getting her number, remembering her name and looking her up on Facebook. Then proceeding to masturbate to her. An alternate form of hooking up.
Man, I booked up with 3 girls last night!

I love booking up with chicks!
2. Booking Up
When one engages in sex chat via facebook chat. Oftentimes dirty pictures are exchanged as one describes the details of the fantasy sexual encounter. If one so chooses, participants may masturbate while doing the one handed typing/clicking move typical of online porn perusing.
"Dude, I totally booked up with my ex last night. It was hot." "I didn't know that booking up was cheating!" "My mom totally walked in on me when I was booking up with Susie."
3. booking up
When two people are all over each other's facebook walls, constantly commenting on statuses, pictures, posts, etc. Instead of hooking up, they're booking up.
Friend 1: "Man what's going on with Ben and Kayla? They comment on everything the other one does on facebook."
Friend 2: "Guy, they're totally booking up."
4. booking up
The act of meeting a girl and instead of getting her number, remembering her name and looking her up on Facebook. Then proceeding to masturbate to her. An alternate form of hooking up.
Man, I booked up with 3 girls last night!

I love booking up with chicks!
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