A fork of Rural Dictionary
During missionary position-sex with a woman, she farts on your balls.
I was having wicked sex with my girlfriend when she gave me a mud flap.
Where a fat guy doesnt have a stomach hanging in front of him like a beer belly or a keg its a big piece of skin hanging down to his waist or his knee's. Like the flaps on the back of the truck
You anda friend see a guy who streaches and lifts his shirt and all you see is skin not even shaped hanging down. Your Friends says "Ew he doesnt even have a keg" You say "No joke it looks like a Mud Flap hanging down like the back of a truck.
Balls. When sitting correctly, a mans testes may cover the anus and becoming a 'mud flap'. Also, when two are engaged in intercourse in the missionary position, the mans testes may cover the woman's anus and therefore becoming the woman's 'mud flap'.
Woman: What's a mud flap? Man: I'll show you...
Getting shit on the back of ones testicles due to explosive diahhrea.
That Taco Bell I ate came out so fast I mudflapped it.