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 4, 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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(adj) to be marsh is to appear as drunk and high as possible to the point where your eyes are closed and you lose the ability to realize the fact that people near you are speaking of how fucked up you look. This can be caused by any combination of mind-altering substances, but especially alcohol and cannabis. You also have the tendency to tell fellow acquaintances that you are "Way too drunk." or "Way too high." or both. Named after the beloved Marsh Robinson of New Orleans/Kentucky. (he's not dead, he's just too marsh)
variations: way too marsh (usually used in this context), darshed out, marshin'
"Hey dawg, I just smoked two bowls, I've had some of this Sailor Jerry's, and I have this 12-pack of PBR in my backpack...I am way too marsh right now.
"
"Man, that guy just turned his head as if to look at something even though his eyes are closed..he's way too marsh.

"I'm waaaaayyy too drunk. Waaaaayyyy too high."
-Marsh Robinson//Darsh Vader/Marshall Mathers/Marshmallow
by catdance November 20, 2011
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To absolutley destroy somebody particularly in sports.
OMG that kid just got marshed! I think he's out for the season.
by That guy, who is awesome November 25, 2012
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A new form of STD contracted by my good friend, while sleeping with too many dirty girls.
A combination of syphilis, gonorreah, genital warts and crabs.
This may seem harsh, this new disease called The Marsh. Its rare not generic and spread by derek, so close your legs bitches and ull stay hoes without itches, if you know girls hes been with, most likely a bohemeth, run for the door to avoid that red sore. If its too late, dont tell your date, just try to pass her on to another mate. LOL
--- Mat and Ty
"Yo man, my balls are itchy"
"you probably have The Marsh"
by noskillz November 7, 2007
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