To be a fat lazy douche. The act of refusing to do things with your friends in order to do things a fat lazy douche would do, such as play Halo, sleep, go to QDoba etc..
Paul-"Hey man you wanna play basketball?"
Jacob-"No im playing halo"
Paul-"Wow you fucking Marsh!"
by Sabattack May 21, 2009

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A small grey winky that sometimes shrivels and hides away. It likes to be stretched and gets scared easily.
The small grey marsh ate a peanut and burped
by peanuthunter March 11, 2011

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To waste something like ciggerate or any food and not enjoy the the taste or the peace of anything.
God damn it dude stop marshing down that ciggerate man.

Dont Marsh down ur food like that bro you might die from diabetes.
by Zainrawrski January 18, 2011

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1.Area of permanantly wet or flooded lowland, home to many small animals, birds and insects.
2. Council estate in Lancaster, England. Near Town Centre and home to the '808' crew. Residents of said area are predominatly, although not exclusively, chavs and those that believe themselves to be 'gangsta's'.
1. Damn it! I got marsh in my shoes.
2. Feckin hell mate! That twat stole ma feckin shoes! Oh it's on!
by poshgolddigga October 30, 2008

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When having heated sexual intercourse in the cowgirl position the male performes the "marsh" by grasping the back of the females head and bucking forcefully with his hips until the females head enters or pierces the headboard/wall behind.
I was having such heated sex last night that i totally marsh'd my girlfriend
by Hector whaller June 26, 2017

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