When you take all the crap out of someones backpack, flip it inside out, put all the stuff back in and zip it up during class. Usually when the person who owns the backpack is going to the bathroom...
"Mr. Hugger, tell Yari to quit turtling my backpack whenever I leave the class"
"I can't find my homework, it must have gotten thrown away last time my backpack got tutled"
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