Top Definition
Synonymous with poop.
I'm heading to the john to twist off a mud rat.
by Zoo Master August 02, 2011
1 more definition
One who works in the oil field hauling and cleaning up drilling mud.
The Mudrat ran oil based and water based mud for an ungrateful outfit for 3 years 3 monthes and 11 days just to be fired for a bogus reason
by Mudrat May 17, 2009

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