When penetrating a womens rectum with your beef whilst they drop a load.
"Dude, that girl kelly totally gave me the mudpuppy"
When you eat ass with a mouthful of chewing tobacco (especially Grizzly Wintergreen Long Cut or Copenhagen).
See also: Skol-pository
Big Terry came running out into the garage and yelled, “Someone give me a lipper, I’m gonna give her the Michigan Mudpuppy!”
Eating ass with a horseshoe chew of grizzly wintergreen in.
Maniac 1: I just put a lipper and ate that dirty girls ass.
Maniac 2: Dude, you gave her a Michigan Mudpuppy!
Eating ass with a horseshoe chew of Grizzly Wintergreen in.
Maniac 1: Bro, I had a fat lipper of griz in when I ate that dirty girl's ass last night.
Maniac 2: Dude! You gave her a Michigan Mudpuppy!
Maniac 1: Hell Yeah!