Megabadass 

Behavior or action that is so cool that by many traditional definitions it would be considered lame.

Dude, that thug was wearing a totally megabadass Mr. Rogers shirt.

Megabadass by joe14joe January 13, 2009

Mega Badass 

A level above badass. You become too badass to be called badass anymore.

Nelson isn't badass anymore. He's gone a level above badass. He's Mega Badass

Mega Badass by asdfgghjk December 25, 2008