Cooning

The art of taking someone's backpack while they aren't looking, removing all the items, turning it inside out, and putting everything back in.

Typically done when someone goes to the bathroom or is distracted.

Alex: "Quick, coon Aidan's backpack while he's in the bathroom."
James: "Cooning is so easy, it's like stealing candy from a baby!"
Aidan: "Are you fucking kidding me, I've been coon'd!"