What is Mississippi Mud Flap?
1.
stupid redneck mullet
"If I see anyone with a Mississippi Mud Flap, I'm going to slit his neck, and shit down his throat."
2.
is when you're doing a chick in the ass, and she accidently shards all over your junk leaving mud on your balls just like a mud flap.
"Dude, i was nailing this chick in the ass and she gave me a Mississippi Mud Flap! So I did a Tony Danza on the bitch."
See