...a sarcastic term used commonly in the popular PC/Xbox 360 game N+ that refers to the suicide that one must perform when there is no way to complete the level they're on. It implies that suicide itself is a "level" even though there is no "bonus" to be found.
"Hey guys! If you press the "X" button you'll be warped to a secret bonus level!"
"Did he just die? Ok everbody, go to the bonus level."