SASS
sass, sassing, backtalk, back talk, lip, mouth
(noun) an impudent or insolent rejoinder; “don’t give me any of your sass”
sass
(verb) answer back in an impudent or insolent manner; “don’t sass me!”; “The teacher punished the students who were sassing all morning”
Source: WordNet® 3.1
Etymology
Noun
sass (uncountable)
(US) Backtalk, cheek, sarcasm.
(archaic) Vegetables used in making sauces.
Verb
sass (third-person singular simple present sasses, present participle sassing, simple past and past participle sassed)
(intransitive, US, informal) To talk, to talk back.
(transitive, US, informal) To speak insolently to.
Proper noun
Sass
A surname.
(Web design) Initialism of Syntactically Awesome Stylesheets (a style sheet language)
Source: Wiktionary