Etymology
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sass (n.)

"impudence, insolence," by 1835, a back-formation from sassy, and ultimately a colloquial pronunciation of sauce. Sass (n.) as a colloquial variant of sauce (n.) is attested by 1775. The verb sass, "to talk or reply saucily, speak impertinently to" is by 1856. Related: Sassed; sassing.

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Definitions of sass
1
sass (v.)
answer back in an impudent or insolent manner;
The teacher punished the students who were sassing all morning
don't sass me!
2
sass (n.)
an impudent or insolent rejoinder;
don't give me any of your sass
Synonyms: sassing / backtalk / back talk / lip / mouth
From wordnet.princeton.edu