"It is the first arcade game to simulate kancho - a form of sexual assault, popular in Japan where the victim is poked with two fingers in the anus whilst distracted."
Note that 'Kancho' is also a linked article, which produces this gem:
"Kancho (カンチョー kanchō?) commonly carried out as a prank. It is performed by clasping the hands together in the shape of an imaginary gun and attempting to insert the extended index fingers sharply into an unsuspecting victim's anus, often while exclaiming "Kan-CHO!"."
shit'll get you shot dead in a KAN-CHO around here, trying to stick fingers up someoI MEAN WHERE THE FUCK DOES THAT COME FROM?!? HUH??!! What cultural anomaly sparked that little gem, hmmmm? I really don't want to know....