pro-nasty 

beyond badass

heard rappers on Robert Macneil's PBS special on language use it.

Yo, that boomin' system in yo ride is pro-nasty dog!

pro-nasty by Mr. Slick P. ProMasta January 5, 2005

pronasty 

Something so good that it is of a professional level of excellence.

"Those rhymes last night were pronasty!"

pronasty by Bruce F. May 16, 2006