Top Definition
Originally coined by a very unknown New Hampshire native when he was trying to wakeboard. It stands for Merrimack River Sack Drag. It is the act of squatting on a wakeboard, sideways, causing the nut sack do drag and bounce on the top of the water.
Dude you will never MRSD as good as Raul! He owns it and can go for miles!
by NHRiverRat January 26, 2011

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