V. The act of taking someones backback when they're not looking, taking everything out of the main pocket, turning the bag inside out, placing everything back in, zipping it up so as the zippers are on the inside making it difficult to open back up, and placing it back next to the person before they find out what you've been doing.
Dude 1: Dude Joe's not looking, grab his bag.
Dude 2: I got it.
Dude 1: Give it here.
Dude 2: What are you doing with it?
Dude 1: Im turtle shelling it.
Dude 2: Nice, go go go.