to take a bag/object, and turn it inside out. Placing all the belongings back in the bag once inside out. The idea is to make it so the bag/object is unable to carry out its task. The bag for example is not able to be carried because the straps are not able to be used because the bag is inside out.
While someone is not looking, you take their backpack, unzip it, take all their stuff out, flip the backpackinside out and put it all back in. It looks like a chicken nugget