berserkber‧serk /bɜːˈsɜːk, bə- $ bɜːrˈsɜːrk, ˈbɜːrsɜːrk/ adjective 
Word Origin
Dad went berserk when he found out.
Word OriginWORD ORIGINberserk
ExamplesOrigin:
1800-1900 Old Norse berserkr ‘wild fighter’, from björn ‘bear’ + serkr ‘shirt’EXAMPLES FROM THE CORPUS
Thesaurus- But how can our uppermost tier go so berserk?
- Toos threw unending series of berserk punches, ignoring incoming rounds as if they were raindrops on a pleasant spring day.
Longman Language Activatorto get angry► get angry
Phrases also get mad American · Mike gets very angry when he loses at tennis.get angry at · You have no right to get mad at me. It's not my fault.
► lose your temper to suddenly become angry, especially after you have been trying not to: · As the argument escalated, Mason lost his temper completely.lose your temper with: · You should never lose your temper with the students - it'll only make things worse.
► blow your top/hit the roof/go crazy/go nuts/have a fit also go mad British informal to suddenly become very angry: · My father blew his top when I told him I was quitting medical school.· "What happened when you told him you wrecked the car?" "Oh, he hit the roof."· Mom would go crazy if she found out you had started smoking.· I'm going to go nuts if that phone doesn't stop ringing.· When Tommy's new bike was stolen, he had a fit.
► go ballistic/go bananas/go berserk also go ape American informal to suddenly become very angry: · If my wife ever finds out about this, she'll go berserk.· Joe went ape when we tried to take the car keys away from him outside the bar.
► get stroppy British informal to start behaving and talking to people in an angry way, especially when other people think this is unreasonable: · She's the sort of boss who gets really stroppy if things aren't done her way.· Mel got a bit stroppy when the maitre d' put us at a table he didn't like.
to start to behave in a crazy and excited way► go crazy/go nuts/go mad also go mad British to start behaving in a crazy, uncontrolled way, especially when you are very excited: · The fans went crazy when the band came onto the stage.· During Carnival the entire city goes crazy for a week.· As soon as the dog hears anyone at the door he goes completely nuts.· When Italy scored the winning goal the crowd went mad.
► go berserk to suddenly start behaving in an extremely wild, violent, and often frightening way: · When they tried to arrest him, he suddenly went berserk.· She went berserk and began shouting at everybody on the platform.
PHRASES FROM THE ENTRY► go berserk
go berserk informal to become very angry and violent: - She went berserk and began shouting at everybody on the platform.
- The guy just went totally berserk and started hitting me.
- When they tried to arrest him, he suddenly went berserk.
- But eight days after this fire went berserk, there are no serious injuries.
- But then Munter goes over the edge, sounding like a Weight Watchers leader gone berserk.
- Converse was commencing another glide when Smitty went berserk.
- He offered to show me, but Alain nearly went berserk and then we got interrupted.
- He wasn't proud of the ability to go berserk because it meant loss of control.
- No, I was a sort of insane ghetto personality who got off on the written word, and went berserk.
- On the table in the front of the room was a telephone, which rang whenever the bond market went berserk.
- She's probably lived such a repressed life she goes berserk when she comes out to the West Indies.
Dad went berserk when he found out.