The result of way too much anal sex - the anus is so stretched out that when it returns to its 'not being penetrated' state, the extra skin forms a flap over the anus.
Since anal is so huge in porn, most pornstars have mudflaps.
by Stegosaurus Rex June 24, 2005

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1)pussy lips
Next, I coated her mud flaps with creme e me, then I passed the fuck out!
Bumpin' uglies leads to inflamed mud flaps

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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 13, 2017

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the foreskin of a gay man.
hey bill, what do you call a gay mans foreskin?

i dunno.

a mudflap!
by g.n.b.rad September 19, 2010

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Extra skin around the asshole creating what is known as a mudd flap or doggie door.
That chick had the craziest mud flap. I just noticed and I've been hitting that for 2 months.
by TrevorK89 April 27, 2015

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An empty scrotum or ball sack.
Pat was born without balls but still has a sack dangling; when he's getting pounded from behind, it acts as a mud flap to keep shit from getting all over the place.
by M F Fuckenstuff July 01, 2016

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v. The act of motorboating another man's butt cheeks.
Justin loves to mudflap men on the weekends.
by suckitcarley March 28, 2015

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