noun. A quality found in only the most excellent citizens, critters, situations, and thingamawhackeys.
Real citation: "Wow! Fabulous week, excellent weekend and Monday doesn't put an end to the excellentness-itude. Just #KFTC ! #fb"
(Sept. 28, 2009, Andy D, Twitter, http://twitter.com/superdtg/statuses/4440724705)
Made-up citation: "Buying the complete Seinfeld on DVD was a decision soaked in excellentness-itude. Pooping the bed, not so much."