Hari Kari is the Norwegian version of the ever so famous Hara-kiri, mostly practised in Japanese regions.
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.

You were listening to Chris Brown and you had no f***ing idea what this ment so you decided to look it up.

To commit suicide using a blade to stab oneself in the stomach. This was practiced in many japanise cultures including bushido.