Top Definition
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."
by Basil of Baker Street January 09, 2011
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