Top Definition
A large fart that is lodged behind a turd.
I thought I had to fart but I had a Man On Deck.

I really gotta fart but I got a Man On Deck.
by FuriousJim February 20, 2012
When you have a large bowel movement ready to emerge at any moment.
I can't have anal sex with you tonight because I have a man on deck.
by CindyDavis February 26, 2011
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