You've Got To Be Fucking Kidding Me, typically uttered in response to anything that is so totally stupid as to be unbelievable.
Note: often pronounced more rapidly as "YiGiTBiFKiM"
Seriously, Congress? You're going to reach an interim deal on the fiscal cliff for now, and then resolve it more permanently in a couple months? YGTBFKM!
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.