sass

Short definition from Wiktionary

Noun

1. 1
   The quality of being sassy.
2. 2
   Backtalk, cheek, sarcasm.
3. 3
   Vegetables used in making sauces.
4. 4
   A subgenre of screamo music.

Verb

1. 1
   To talk, to talk back.
2. 2
   To speak insolently to.

Proper noun

1. 1
   A surname.
2. 2
   Initialism of Syntactically Awesome Style Sheets, a style sheet language.