A sexual act, in which a person begins to eat their significant others ass from behind. The receiving participant then sharts, leaving a spray of fecal matter on the other involved participants face, similar to mud speckled on a mud flap.
My boyfriend said he wanted to try something new in bed last night. I wasn’t even two minutes in, he sharts and redneck mudflapped my face.
by Tmoorecmooretacomunch January 04, 2021
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Excess layer of droopy fat found hanging below a redneck's package.
Cooter: I can see your Redneck Testicle Mudflap in those new skinny jeans.

Earl: Curse you Cooter!
by TERminalambiaNCe August 29, 2012
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