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The sexual act of inserting a marshmallow into a woman's vagina, then extracting and eating the marshmallow. Can be done with multiple marshmallows or any size (regular, Jumbo, mini, etc.).
My girl was just begging me for a Mississippi Marshmallow, but we were all out.

Hey dude, I saw Matzek giving you're girl a Mississippi Marshmallow on a pool table at Shotts's party.
by Sammy Slut Socks March 24, 2011