What is the meaning of Berserk?

Synonym of berserker (“a Norse warrior who fought in a frenzy”).

Furiously, injuriously, or maniacally violent or out of control.

1. Bizarre; weird.
2. Wildly joyous; ecstatic.

   Bizarre; weird.

   Wildly joyous; ecstatic.

   To be or become berserk.

   To make berserk.

   berserk

   berserk, berserker (frenzied Norse warrior)

   berserker (Norse warrior who purportedly fought in a trance-like frenzy)

   Source: wiktionary.org