This term is used to describe that you're college roommate won't be in the room for a while which means you have plenty of time to rub one out. Usually these words are yelled out.
My roommate went home for the weekend so it's going to be BEAT OFF CITY in this piece!
A combination of skell & scumbag. One who possesses the qualities of both. This person is generally a low life who also doesn't hesitate to back stab his friends.
Bezzy: Can you believe he fucked Tim's ex-girlfriend right after they broke up and then stole $20 from her purse for crack money?
Carts: That's ridiculous. I thought they were boys and all of a sudden he does that. What a skellbag.