An extreme and childish display of unreasonable anger, frustration, or distemper. I can't believe you threw a temper tantrum like that just because I didn't want to go see some movie with you!Becca's been having really bad temper tantrums lately. I guess she's just going into the "terrible twos."
to have a temper tantrum; to put on an active display of childish temper. I never dreamed that Bob would throw a tantrum right there in the department store. You must be so embarrassed!