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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Amazing last name of a man with a bright future and dreams to be accomplished. Sexually the best thing a woman has had. Intellegent and Strong. One of Gods best creations. Honesty is his best policy. Selflessness is his hobby and he would never hurt anyone unless they were a douche.
Girl 1: See that guy in the blue truck???
Girl 2: Yeah... What about him?
Girl 1: He is in my engineering class... He's totally a Marsh.
by LillyAmore August 8, 2008
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Frequently described as being in a in a fucked up situation, screwed, or just losing at life. Also used to describe muddy, swamp-like land.
Your 20 years old, not in school, don't have a job, and you have a kid on the way, your in the marsh.

Joe: Man I missed the last bus home.
Ben: IN THE MARRRSSHHH!!! LOL you betta hitchhike.

Brian got mud on his new sneakers when he walked in the marsh.
by Sincere7 April 6, 2011
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To be or be affected by the marsh.
DUDE YOU JUST GOT FUCKING MARSHED
by Agent X July 15, 2008
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An imaginary world where only the coolest people exist. Current population: 3
Wow! You are way cool, you must be from marshe.
by sherrie bell June 11, 2008
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To be continually given plastic pint glasses by a barman when everyone else in the pub is given real glasses.
Ffs that barmaid Marshed you off again!!!!
by Bazbourne July 5, 2020
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