Fig. to become irrationally enraged. (Ballistic refers to a missile launching; postal refers to an enraged post office employee attacking those at his place of work. See also go into orbit.) The boss went ballistic when he saw my expense report.She was so mad, I thought she was going to go postal.
go ballistic
to become extremely upset and excited It took almost an hour to get our food, and Mike almost went ballistic when they brought him the wrong thing.
to become very angry and start shouting or behaving violently Apparently, he told Sandra that he'd been out for a drink with his ex-girlfriend and she went ballistic.
go ballistic
Become extremely upset or angry, as in Dad will go ballistic when he sees you dented the new car. This expression, a variation on go berserk, originally alluded to a guided missile going out of control. [Slang; mid-1980s]