That's so Palin 

Used to refer to something someone has done or said that is so fucking stupid, American VP candidate, Sarah Palin herself would be jealous.

Or,

Simply used as a referent for something pretty on the outside, but completely devoid of the rational faculties on the inside.

-That's so Palin! (compare to: That's so Raven!

Bryce:
"...and so I nearly ran over the fucking kid in broad daylight because I was beating off and texting while driving, without my prescription lenses on.

Carl:
"Dude... That's so Palin!"

That's so Palin by Taylor Playgreen February 21, 2009