ADJ-A modern, contemporary way to express that something is repulsive or disgusting.
Dude, that pimple is neasty.
Adjective used to describe someone from Northeast Philly. For females, it typically describes someone who uses a great deal of hair products to obtain a slicked back ponytail, an overabundance of makeup, and big hoop earrings. For males, it typically describes a white boy who wishes he were black but is kind of racist at the same time. Both genders exhibit overuse of the word "ain't", wear oversized GAP hoodies/fleeces and Reebok Classics, and use do-it-yourself hairdye kits.
Damn, that girl is so neasty! I bet if I knocked on her head her hair would crack!