Can also be used to describe something that is just pure awesome. Opposite of Bungle.
Person 2 - Yeah, its totally clancy
Person 1 - True
girl two: HOW EXCITING!
girl one: dont get too excited, he's a clancy!
girl two: *gasp* WHAT A DOUCHE!
girl 2: why?
girl 1: my new bf is a clancy
girl 2: ZOMG YOU HAVE TO DUMP HIM
girl 1: i know -sigh_