A sexual act in which one partner defecates into the other partner's mouth. Shortly after, vomiting will ensue. Whilst the "bucket" if firmly held shut, the first partner then fucks the other's mouth.
Once completed, the "bucket" will consist of Shit, Vomit, and Semen.
Take a rich ass shit in a bucket, then make the girl get in doggy style, and put the bucket in front of her and make her put her face in the bucket while you fuck her from behind.
Holy Shit Goober, i gave that slut last night the stinkiest Michigan Mudbucket ever, she smelled shit for a week!!!