My daughter suggested 'Rad' (as in radical) and from her British friend 'Wicked'
From your About.com Teen Dictionary, I liked 'Da bomb' 'Fly' 'Rocks' 'spun' (for clothes) 'totally' and 'grooviness'. They mentioned 'Way' both as 'Way cool' and 'Way' as a response of agreement.
Also 'phat' but I have trouble distinguishing between 'phat' and 'phat-phree', it would have helped if they gave more situational examples. I am certainly 'Fat' but I doubt my kids would call me 'Phat'.
http://parentingteens.about.com/cs/familylife/l/blbwords.htmThanks for these and any further examples.