Berserk (noun)
A crazed Norse warrior who fought in a frenzy; a berserker.
Berserk (adjective)
Injuriously, maniacally, or furiously violent or out of control.
Berserk (adjective)
weird; strange
Wiktionary
Berserk (adjective)
out of control with anger or excitement; wild or frenzied
“a man went berserk with an arsenal of guns”
Oxford Dictionary