It means exactly nothing, and I think that's the point.

I assumed it meant "nonspecifically, but impressively, tough."

Like my fist has the power of a supernova explosion?

Is your fist's energy not a derivative of the big bang itself? Where did you think your fist got its energy from?

Supernova would be underestimating the power of your fist. Truly think about the history of the energy of your system!

YES!

Probably a certain amount of over-pressure. Marketing nonsense, though.