Sass and back talk

Hi everyone,
Anyone who happens to know wut this means?
Her 'fresh mouth' and lack of respect for me.


Thank you all!

Merriam-Webster online:

Fresh -- Probably by folk etymology from German frech. Disposed to take liberties. IMPUDENT.
Impudent -- marked by contemptuous or cocky boldness or disregard of others : INSOLENT.

You might say much the same thing about the expression "smart mouth," except as regards the etymology. I think it can be used as a verb, but I don't guarantee it. "Don't you smart-mouth me!" SS

Then there's: sass and back talk.