"Pretty Frikkin' Cool." This abbreviation first originated at the University of Florida to describe the new technology used during Engineers Week 2012 but has since then expanded to a general term describing anything that causes one to stop and say, "Hey, that's pretty frikkin' cool."
PFC can be used as both a noun and adjective, as illustrated in the examples below.
There's some mad PFC heading your way.
The E-Week website is PFC.
"Hey man, how you get so PFC?"
"It's a gift, my brother."