To invert somebody's backpack while they are unaware of what is happening. Done by taking somebody's back pack while they're not looking, taking out all the books and paper, inverting the backpack, and then reinserting anything that was taken out. The backpack is then placed back where they took it and by the time the person sees it again, everyone will burst out laughing.
I was talking to bob in class, and some asshole spacemanned me.
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