1. He/She is a someone with a nasty big ass.
2. Someone you know who takes nasty to the extreme.
3. A title given to someone in your crew that is the nastiest.
1. "Yo man did you see that MoNasty strutting down boardwalk." or "I couldnt tell if it was a he or a she but it was definelty a MoNasty!"
2. "everyone got their nasty on last night, but that dude went MoNasty"
3. "Becasue he pulled out a bum finger on that dude, he deserves the honor of being called MoNasty"