2 gays fucking and their balls sacks are smacking.
Ed and I got together last night for some windy city mud flap.
The act of shitting ones self while wearing tighty whities and quickly ripping them off and flapping them over the head of an unsuspecting bystander.
"Dude! I totally give that bitch Shelly an irish mud flap last week...I'm pretty sure she had to shave her head!"
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Roast Beef Mud Flaps are the oversized lips of the vagina that resemble the mud flaps on a semi truck if they were made out of roast beef. This phenomena is often related to the woman having an excess of sexual partners, and/or extreme stretching by the use of sexual toys.
Chris: Hey man, did you end up hitting that last night?
Ken: Yeah, but it wasn't that great.
Chris: Why not?
Ken: Well, she had a massive set of roast beef mud flaps.
Chris: Were they that bad?
Ken: Yeah, it looked like she road a chainsaw to work everyday.
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When your having sex doggystyle and the girl explosive diarrheas on the man's testicles.
"Did you hear what happened to Josh? Melissa gave him a West Virginia Mud Flap"
Hanging a single strip of toilet paper behind your butt to prevent spraying the back of the toilet. See also "splurtin curtain"
I don't even have to clean my toilet yet because I used a mud flap!
1: yo how'd you like your spicy food
2: excellent. it left my mud flaps flailing on the toilet
The hairy patch of a Man's lower back that is just above his butt crack.
(Hairy Man bent over with pants falling down in the back ) Hey your mud flaps are showing, pull up your pants.