Language is a living, breathing, constantly evolving thing. Dictionaries, on the other hand, are sluggish to catch up. Oxford had added woot to its stable, but others are lagging behind. I doubt you can play it in Scrabble, and it's a word I used all the time, especially in writing.
On a related note: Spirit Sanguine made finalist in the 2013 Rainbow Awards. :) I'm not gonna make a Facebook post about it, because there are a lot of finalists, and FB is already exploding with the announcements.