Definition of berserks:
(adj) :
Furiously, injuriously, or maniacally violent or out of control.
(v) :
(intransitive) To be or become berserk.
(adj) :
(by extension) Bizarre; weird.
(v) :
(transitive) To make berserk.
(n) :
(historical) Synonym of berserker (“a Norse warrior who fought in a frenzy”).
(adj) :
(by extension) (rare, dialectal, slang) Wildly joyous; ecstatic.