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.
Of all dictionaries Urban Ditionary displays the highest levels of BadAssMothaFuckery crushing all competition in that category.
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,
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"