Kanchō is a prank performed by clasping the hands together in the shape of an imaginary gun and attempting to poke an unsuspecting victim’s anus, often while exclaiming “Kan-CHO!” It is common prank among children in East Asian countries such as Japan, Korea, and Taiwan.

The word is a slang adoption of the Japanese word for enema (浣腸 kanchō).In accordance with widespread practice, the word is generally written in katakana when used in its slang sense, and in kanji when used for enemas in the medical sense. [Via: wikipedia]

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