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 05, 2010

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Top Definition
A smile with an attitude.
I grinned and shot him in the head.
by grin March 05, 2004

The Urban Dictionary Mug

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The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

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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 24, 2013

The Urban Dictionary Mug

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

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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

The Urban Dictionary Mug

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The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

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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

The Urban Dictionary Mug

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

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Fellatio, oral sex, blow job
Dude did you hit that ? No I just caught some grin.
by jmo401 July 08, 2015

The Urban Dictionary Mug

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Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

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Similar to the old enjoyable verticle smile. It's a hoe's pussy yo!
Gotta love the grin.
by Griz November 16, 2004

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt