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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mud flaps are the lips lining the pussy, a good example of mud flaps that are easily visible would be a hot asian chicks.
her mud flaps were sdo loose and flappy they looked like a ball bag.
by dave(Dream team) January 27, 2005

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A person whose usefulness barely extends past that of a tire shroud or bug deflector.
Can't you do any right? You're a mud flap! Now get me a beer!
by Bigelow October 16, 2003

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Sagging butt cheeks with age and weight loss such that a pencil could be held in the crack between back upper thigh and bum. Vastly superior to all alternative definitions for the sheer ubiquity of the phenomena but also because legs are the human equivalent to wheels and human mud flaps are therefore perfect homologues to vehicular ones. Entered Urban lexicon in Spinal Tap's hit Big Bottom in which this second chorus appears:
Big bottom, Big bottom
Talk about mud flaps
My gal's got 'em.
Big bottom
Drive me out of my mind.
How can I leave this behind?
by Jellybean Sherbert September 15, 2008

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a style of pants used to protect the back of your thigh/upper calf from burning when sitting on a fake leather bench seat in an '82 ford pickup. also used for float trips to protect from a hot canoe seat.
"ey jerry! whure's muh mudflaps!?"
by guskillface August 21, 2009

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when your out riding four-wheelers and a girls flanges are flopping on the side of the seat colecting dust , and turning into mud.
janis your mud flaps are hanging down.
by mud dobber June 13, 2009

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The huge folds of skin near a fat girl's vagina.
I couldn't find her clit b/c of her huge mud flaps.
by digoldong November 19, 2007

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