Janning out

Accepted as a colloquial for the first person to fall asleep or leave at a social event

Synonyms: Bitch out, punk out, geek out, pass out.

Did you see that guy Janning out at 10:30 last night?

John- "Hey man, where's Bill? He invited me over here fifteen minutes ago..."
Bob - "Oh, he's Janning out in the tub."