Grimfuck

When someone nods yes with a smile and then turns around to ignore everything they just agreed to do.

BOSS: Hi Bill! You get those TPS reports filed by Friday. We have a serious audit coming up next week and need it done.
BILL: Sure thing, boss! *smiles* *grins*

1 week later:

BOSS: Bill? Where the fuck are the TPS reports?! We're being fined by the SEC! You stood there and grimfucked me last week!