Something that is equally both gross and nasty.
A duck took a shit on Conan O'Brian the other night. Man, that was grasty!
a word i made up today when i was trying to say gross and nasty at the same time. it means something is both equally gross and nasty
Alexa : That girl is so grasty!
Valerie: What's that?
Alexa: Gross and nasty. DUH.