Black Adam isn't even close in my opinion. He's done two cool thing in the past fifty years and those were ripping Father Time's face off and poking Psycho Pirate's mask through his eyeballs.
Anyway. I'm not sure who the pinacle of totally badass is to be honest, though I would like to nominate Thanos and Lobo.
http://www.youtube.com/watch?v=3rMsbeucW6Y
Anyone there wins....