Synonymous with poop.
I'm heading to the john to twist off a mud rat.
by Zoo Master August 02, 2011
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