Canyon

A unique period in the menstrual cycle, Justin Bieber being the only known woman to experience this stage of the cycle. It involves ovulation from the kidneys, rather than ovaries and can cause high distress levels, often resulting in an inability to walk.

Male A - "Dude, what's up with her?"
Male B - "I dunno man, it's like she's on her canyon"

by L33T no-scoper May 25, 2010