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!
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Frank was so into it last night he was mudflapin like crazy
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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.
โWhyโd you put the dollar bill there?โ
โThe dollar in the g string act it good but overused so I gave her a mudflapโ
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.
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Used to describe a girl with a very flat/unattractive ass
Tom: Cindyโs kind of hot
Jason: Bro she has mudflaps
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