look up any word, like swag:
 
1.
In business when someone smiles and shakes your hand assuring you that they have heard and will act upon your recommendation or concerns when in truth you have already been ignored and dismissed.
Manager Bob: "Our associates will not repond positively to further cuts in their benefits. I strongly recommend against it."

Executive Dick: (Smiling, shaking Bob's hand and massaging his shoulder)"Thanks Bob, we'll take that under advisement. You know our employees are our most important asset."

Dick then processes Bob's pink slip and cuts non-management benefits by 30%.
by Krace September 14, 2004
 
2.
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.
by Brad Johnson June 18, 2006
 
3.
The recognisation of a predetermined response from an individual or group, incorporating a meaningless smile or grin, to reassure one that they haven't been listened to for the past 30 minutes.
Sophie stared across the table at her manager.
'You will take on my recommendations, won't you?'
Mr Taylor beamed, 'Of course we will.'
Sophie sighed, immediately realising she'd been grin-fucked.
by liskam October 27, 2003
 
4.
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.
by Peppershit Cornstalk August 13, 2009