To grin is to put on a big smile.
A girl at the bar , grinned at me. But I was wrong to think that I have any chances of getting her as she already had a boyfriend.
by Dixnory May 27, 2017
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Slang for marijuana (usually laced). A word used primarily in the West Coast in the 1990's.
See also water or wet.
"I threw away all my grin... and I feel strange..." --Sage

"What's your poison? Grin or gin?" --Carl Johnson

"Man I couldn't find that wet I buried, so I'm making my own. It's easy, fool!" --Ryder

"That ese put dust in my grin."
by 4 LIFE May 25, 2013
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A play on words of the Pittsburgh expression "Yins" and the bud expression "Greens." Mostly exists to make fun of pitssburghians.
Yo can I get Grins on this bowl?
by Rocky Lebron June 17, 2010
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smile so sickly sweet it make onlookers through up on site, or passing meat heats punch the grinning idot!
look at the grin on that bloke he looks like hes just got a new girlfriend
by taity July 26, 2006
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An irritating, cringe-worthy substitute for a "smiling" emoticon. Used on internet message boards. Very often follows a very weak attempt at a joke.
The trees might bark at you, I suppose *grin*
by sooth July 12, 2005
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an acronym for the set of technologies: genetic, robotic, information & nanotech.

the convergence of theses technologies into a single technology.
investing in GRIN stocks is a sure thing right now.

our children will need access to grintech if they are to compete in a global economy.

GRIN technologies are the modern day 4-horseman of the Apocalypse.
by g.SPIN December 5, 2010
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