an interjection or adjective of joy, most often used as a response to, or to describe something that is, beyond all doubt, awesome.
Fernando: I just got a new '76 Corvette Stingray! It's neon green with a white leather interior!
Seamus: THAT is wicked groovy.
something so undeniably schweet that you want to strip
betsyface: I found $2 in my pocketses
chuck norris: really? finding money is wicked groovy!