badass /ˈbædæs/adjective 2noun 2forms 3 adjective2 •(US, slang) Belligerent and troublesome.Uncle Jr. was really quiet. Probably because he was a junior high school teacher and was around badass, hollerin' kids all day. — 2005 •(US, slang) Having an extreme appearance, attitude, or behavior that is considered admirable.That tough guy looks badass. noun2 •(US, slang) A belligerent or mean person; a person with an unpleasantly extreme appearance, attitudes, or behavior.Don’t mess with that guy, he’s a real badass. •(US, slang) A person considered impressive due to courage, skill, daring, audacity, and/or toughness."I'm a badass." (Jack Nicholson to a New York friend, early 1973.) — 1975 formsbadasses · more badass · most badass