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Means you're so worn out you could fall asleep in a toilet. Came from sleeping with a pillow between your knees like a baby who got spanked.
After working 12 hours and crying in the subway, I'm P-byk.
My dog is P-byk after chasing a squirrel through three neighborhoods.
I'm P-byk because I tried to explain my life to my mom and she still didn't get it.