To "crew up" is to get one's close friends/associates with the goal of either going out and doing something as a crew, whether it be something recreational or getting the squad together to beat someone's ass.
-Yo, vro, there's this one guy trying to slide into my girls DM's
-Aight, well crew up and let's go fuck him up!
Someone playing Halo 2 who kills you while your health meter is low or someone who does not participate in fights between 2 or 3 people steals the kill to get the double or triple kill.
Antonio is such a clean up crew. He comes during a fight with full health and gets a double kill.
When you have an orgy with at least 10 janitors and all the liquids get on the floor and at the end the janitors have to clean it up with their tongues
"I was at school one day and we had to hire the clean-up crew"
A term used in a standard FPS, or otherwise competitive Player versus Player game, where all of the other teammates are trying their poor little heart outs, only to have their rightful kills stolen by their bastard teammate.
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.