another variation of BigNasty refers to a Big-N-Tasty for McDonald's describes a large person who doesn't seem to know they are large because (s)he wears too little clothes.
"Keva! Did you see BigNnasty at the dance?
No! Thank goodness i heard she looked big and nasty!"
The best damn streamer with a meat bigger than all other meats. A man, who's single glare strikes fear into the hearts of his enemies and floods the loins of every woman. He is BigNTASTY.