It's generally a bad sign. I wrote at length about it here: http://thesethings.posterous.com/rapping-grandmas-and-ninja-...

The gist of my post was: Originally, it was a way to suggest to a technical candidate, "Don't be scared, our place of work respects technical people." It was a code in a way for, "We're not a boring bank. Or if were are, you still might have fun here."

Now I think the term leveraged in the opposite interest: "We need YOU, the candidate, to be awesome. But our wacky language still gives no clue about us, the employer."