The act of being super awesome reaching a near God like status while at the same maintaining a high reputation among a)your peers b) Everyone else that sees, hears, or is lucky enough to be graced with your presence therefor making you that "mothafucker".
In the movie Pulp Fiction, Samuel L. Jackson epitomizes BadAssMothaFuckery.
To break someones face, take their lunch money, pimp their momma, still their girl, ask for a ride then blow up your car, piss on your chest for talking shit, blow hot weed smoke in a cops eye, shove a kali stick up your peehole, and look good while doin it,