Kanchō

Kanchō (カンチョー) is a prank performed by clasping the hands together in the shape of a finger gun and poking an unsuspecting anus, often while exclaiming "Kan-cho!

"[1] It is a common prank in East Asian countries such as Japan.

[2] In Korea, it is called ttongchim (Korean: 똥침),[3][4] and in China, qiānnián shā (千年殺).

[5] 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.

In English-speaking countries, the term "goosing" generally refers to a comparatively mild grabbing of the buttocks with the tips of the fingers and thumb in imitation of a harmless bite on the butt from a goose.