Great word, eh?
I couldn't think of another word that fit my thought more appropriately.
Today I was updating our master contact list at work and was begrudgingly going through each category of my boss's list trying to put them in the right sections. I made it about 3/4 of the way through his list and as I started to get antsy and wanted to move on to the next project....I came across a category that I didn't recognize.
I laughed out loud when I saw it and immediately recognized every name in the group.
Category name: Wacko.
And every single one of them had earned the right to be categorized as such.