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1. grinfucked
When you are "fucked", or taken advantage of, by a lie told from a grinning mouth.

The smiling used car salesman using lies, convinces a customer to buy a car that breaks down a week later. The customer was grinfucked.
2. grinfucked
To fuck up someone's grin when they are grinning like no other
Joe came in grinning today so I told him I fucked his girlfriend. Joe became grinfucked.
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