kancho prank; poking someone's anus with index fingers
Childish prank where the index fingers are clasped together and jabbed into someone's anus, often while they are bending over. The word is a pun on 浣腸 (enema).
See also: 浣腸
When I was in elementary school, my friends often gave me a kancho.
Kancho is just a prank, but it can be dangerous if you go too far.