To possess amazing qualities and be a generally cool person. Cossy is a term to describe something that cannot be described with words like: Cool, Rad, Sweet, Gnarly Etc.

If one is awesome enough to be called Cossy, you know damn right that they are cooler than cool!
You're a pretty cool guy, but I've been told i'm Cossy. Compared to me you're lame!
by McCossyface February 13, 2010

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