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1.
Something so good that it is of a professional level of excellence.
"Those rhymes last night were pronasty!"
by Bruce F. May 06, 2006
14 3
 
2.
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!
by Mr. Slick P. ProMasta January 05, 2005
15 5