sass

sass (http://definr.com/sass)

     n : an impudent or insolent rejoinder; "don't give me any of
         your sass" [syn: sassing, backtalk, back talk, lip,
          mouth]
     v : answer back in an impudent or insolent manner; "don't sass
         me!"; "The teacher punished the students who were sassing
         all morning";