mississippi steamer
When you put a plastic bag on your partner's head then take a dump on their face.
"Yesterday I took my girl to my house and had a big mississippi steamer on her head."
Mississippi Steamer Bean
The act of putting your poop into a ziplock bag and microwaving it. Later putting it on your partners head.
Hey wanna come to my house and give each other a good ole fashion Mississippi Steamer Bean?