Top Definition
From the song, Grinfucked on The Fury of Our Maker's Hand by Devil Driver. Meaning to screw someone over all the while they believe you are their friend.
The way your boss took the credit for your work all the while telling you that he was going put you up for promotion. You just got grinfucked hard.
ayon kay Hydroeric ika-10 ng Abril, 2006

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(verb)- to be overly cheerfully deliberately misleading.
"The little bastard grin fucked me when he told me he'd finished the project."
ayon kay David Baglio ika-10 ng Hunyo, 2008

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grin fuck (verb) - a sales technique in which the salesman smiles profusely while delivering bad news. Since 80% of human communication is based on body language alone, the simple deception of grin fucking is often enough to prevent the victim from fully conceptualizing the bad news until later, after they've already agreed to the deal.

Note: the best defense against grin fucking is to call attention to it by casually asking the salesman why they are smiling.
Salesman <while grin fucking the hell out of you> We had to order a part from overseas, so the invoice came in $500 over the original estimate.

You <after sipping your coffee>: Why are you smiling? That sounds like bad news to me.

Salesman <suddenly befuddled>: Oh... no reason. I guess I'm just in a good mood today.

You: Okay, well, since I never approved the additional costs, what discounts can you provide to bring us back closer to the original estimate?
ayon kay zerrlok ika-13 ng Setyembre, 2011

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The act of slitting somebodies mouth open from side to side (IE chelsea smile) And then repeatedly fucking the gaping wound.
When I grinfucked Tom.
ayon kay Candyclub4kids ika-24 ng Hulyo, 2011

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The act of making a "WHOO" sound really loud and its sorta like a death metal growl.
"Hey grinfuck that guy!"

-innocent guy walks by-

"WHOO!!"

-guy gets scared runs away"
ayon kay Mr.Sexy ika-04 ng Setyembre, 2007

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