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When you are in some serious shit and wading in it. Worse than knee deep, better than up to your neck. Also commonly used as "waist deep in shit."

Alternate use: The appropriate minimum height to pee discreetly when in a body of water.
He was waist deep and no amount of pleading would get him out of the chasity belt.
by Dlee1967 July 10, 2014
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