(adj.) a ghetto combination of the words "sick" and "nasty" used to describe a person or persons as both sick and nasty. (may also be used to describe animals)
plural form: sicnasteez
verb form: sicnasting-the act of being sicnastee
Jessica: Omg, look at Brittany's outfit!
Madison: She is sooo sicnastee.
Madison: Are Landon and Farrah back together?
Jessica: Yeah, they're a real sicnastee couple.
fun way to say nasty, also implying that you really think something is gross instead of nasty as in cool. falls into the fun words category with schwasted and schwafted. if it's not fun to say, don't say it.
A: i just saw The Hills Have Eyes last night. some of those mutantpeople were really schnasty.
Sick Nasty is not merely sick nor just nasty, it exceeds all expectations of awesomeness and creates its own arena of wild. Sick Nasty is pure awesome in its truest form.