You did well to reject: bob-the-ultragreat rob-the-ultrarich fob-the-ultra-off gob-the-great-off mob-the-great-unwashed corn-on-the-cob-the-amaizing-grace s-o-b-the-great-**** ultra-the-shrinking-violet
What's great about this word is twofold: Firstly, it is double-barrelled, but not in the literal sense, since I've purposefully not bothered with the hyphen.
Also: I came up with the word myself, just now, when trying to come up with a nickname for this site. And I'm pretty damn impressed with it! Though I freely admit the novelty will run off very quickly. In fact I think I'm tiring of it already. No, actually this is not yet the case. It's ace!