smart off

Verb

 * 1)  To show disrespect verbally; to smartmouth.
 * 2) * 2002, Ken Lockette, "Surviving the Soviet Legacy, in A World of Teaching: Personal Journeys Through the World's English-Speaking Classrooms, eds. John A. Hansen, Evan M. Smith, page 44
 * He despised being away from the rest of the student body and would occasionally act out in defiance by smarting off or by being uncooperative.