1. [1920s+] (US) irritated, annoyed, feeling sour, supercilious.
2. [1920s+] (US, also salty-ass) tough, aggressive, used of a veteran of a particular environment, e.g. a prison.
3. [1920s+] (US teen) a general pej., unpleasant, uncouth, crude; of language, obscene.
4. [1980s+] of a garment, well-worn, ‘lived-in’.
1. [late 19C–1930s] something or someone very exceptional.
2. [1970s] one who uses an excess of obscene language.