To smuggle fish in your anal cavity back to Minnesota
Kenny pulled the North Dakota mud puppy to get 2 extra limits of walleyes back to Minnesota.
Doggy-style anal sex with a girl missing a tooth.
Bro 1: Hey, I fucked that girl last night.
Bro 2: The one with the lazy eye and no front teeth?
Bro 1: Yeah, I gave her the ol' Mississippi Mud Puppy in her brown eye!