Only pertains to fatasses; when the amount of flab you have overhangs enough to interfere with going to the bathroom and thus makes contact with urine or shit making the flab act like a mudflap behind a truck tire.
EG: Damn thats a big bitch, her mudflap is bouncing off her knees when she walks!
by tehleet- January 27, 2010
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What you call a gay mans sack
Frank was so into it last night he was mudflapin like crazy
by COOREY August 7, 2007
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When a customer places a dollar bill between an exotic dancers heel and shoe, allowing the dollar to flap around like the mudflap on a truck.
“Why’d you put the dollar bill there?”
“The dollar in the g string act it good but overused so I gave her a mudflap
by Jägertron March 2, 2023
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When you fart on her tongue while she is giving you a rimjob.
Nancy didn't appreciate the mudflap she received while giving Archibald the rimmer he so badly begged for.
by Butter Tits August 12, 2017
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Used to describe a girl with a very flat/unattractive ass
Tom: Cindy’s kind of hot

Jason: Bro she has mudflaps
by nalydsemaj August 14, 2019
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