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When one takes a marshmallow and rests it on anothers anus, and then forcefully insterts it using a penis. This continues until the anus is almost completely filled with marshmallows.

Marshmallow creme may be used as lubrication, but anal lube is a definite no go, since the marshmallows will eaten out of the asshole afterwards.
"Hey what do you want to do tonight?"

"Ohhh I suppose we could try Marshing..."

"Yes! Let's do it!"
by Leeby April 03, 2008
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Marshing (Extreme Marshmallowing): The art of catching a marshmallow in your mouth in the most physically creative way possible.
Jannet and Bertrice went to town for a good old fashion Marshing, Jannet caught a marshmallow in her mouth after resting it on a jet plane that took off for battle against alien invaders, eventually the marshmallow fell off the back of the plane that then fell directly into her mouth.
by Wonderwood July 12, 2011
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To spend an extremely large amount of money on one single event.
Involving lots of meat, and a ton of extra food.
To over do something drastically.
by Man who Marshed last night October 26, 2008
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holding the marshmellow over the fire until it becomes crisp, hot, sticky, and delicious.
Devon is marshing her marshmellow.
Devon marshes her marshmellow near the marsh.
Devon is a marsh.
Devon wishes she lived in marshville with all the little marshes.
Devon loves Nichole and they are going to marsh marshmellows at a fire someday.
by Nichole K. September 25, 2007
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