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1.
A rain storm is approching and your car is dirty, so you decide to leave your car out so it gets washed by the storm.
Guy 1: "Man, your car is filthy!"
Guy 2: "Yeah, but it's supposed to rain tonight so I'll just leave it out side and hit up the redneck car wash."
by iroc78 March 11, 2009
 
2.
To cover your truck and / or other 4x4 vehicle and maybe yourself in mud.
Guy 1: "Hey wanna go muddin Saturday?"
Guy 2: "Sure, my truck could use a redneck car wash."
by someguy283298 November 03, 2006