The shot has the effect of using intense spin to push the opposing player's racket into their stomach giving the illusion of Seppuku.
Seppuku (切腹) is a form of Japanese ritual suicide by disembowelment. Seppuku was originally reserved only for samurai. Part of the samurai bushido honour code, seppuku was either used voluntarily by samurai to die with honour rather than fall into the hands of their enemies, or as a form of capital punishment for samurai who had committed serious offenses, or performed because they had brought shame to themselves. The ceremonial disembowelment, which is usually part of a more elaborate ritual and performed in front of spectators, consists of plunging a short blade, traditionally a tantō, into the abdomen and moving the blade from left to right in a slicing motion.