It was part of the (Samurai) code of honour (Bushido) and practiced amongst the warrior class.
Poiter: I'm so depressed I could commit hari-kari.
Jimbo: Isn't that an Indian restaurant?
Poiter: Oh yeah, I meant Hara-kiri.
2. To "off" ones self in a passionate fit of rage.
3. An intentional act of self-destruction.
Hari Kari is practised with a cheese slicer, or preferably a binder (both are Norwegian inventions). You stick the device in your stomach to commit suicide when you are tired of all the polar bears running around in the streets, and wearing woolen socks in the winter. When using binders, be sure to poke around thouroughly as it might take some time if you poke only once. For cheese slicer users, slice several times.