A word used to describe the women-take-longer-showers-than-men phenomena. It has never been proved what exactly takes them so long to complete a shower, but one can safely assume that they've discovered the enlightenment described in Buddhist philosophy, i.e. Nirvana.
Person 1: Man, what is taking her so long in the shower?
Person 2: Dude, don't worry about it, she's probably just discovered shower nirvana.