US slang, sometimes offensive
1 : the state or condition of being a badass : badass quality or character The Seattle quartet, hailed as godfathers of emo back when that word made you think of something other than “eyeliner,” indulged the distorted guitar badassery of their grunge-era brethren …— Rob Harvilla, Village Voice, 22 Sept. 2009 2 : the actions or behavior characteristic of a badass
Neveldine and Taylor's … action scenes rely mostly on blood spurts instead of feats of badassery … — LA Weekly, 3 Sept. 2009