This popular school "prank," which probably has never been referred to as such by people on the receiving end of it, consists of putting one's hands together, extending the index fingers, and then plunging them between the cheeks of the chosen target for (hopefully not literal) shits and giggles. It's kind of like the East Asian equivalent of the wedgie, only it's perfectly acceptable to pull it on teachers -- like Fred, who almost fell victim to it many times while teaching in South Korea. There, the digital assault is known as "ddong chim," meaning "poop needle":
"I have a little 2nd grader here who has marked me as his target for this. He follows me into the bathroom and often breaks out of the crowd, using taller students as cover while he approaches for the attack."
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Basically, imagine being stuck in a building full of miniature, psychotic proctologists trained by Jason Bourne.
The same practice is known as "kancho" (literally "enema") in Japan, where it's become the bane of the existence of many foreign teachers. Although for accuracy's sake, we must point out that ddong chim differs from its Japanese counterpart in that you can also get "poop needled" by old women on the subway, which a friend of Fred's once had the misfortune of learning firsthand. We're assuming this was followed about at least a decade of trauma therapy.