Meaning

adjective frenzied as if possessed by a demon

adverb wildly; without self-control

adverb in a murderous frenzy

originBorrowed from Portuguese amouco, from Malay amuk (“to go on a killing spree”). The term first appeared in English around the 16th century, associated with the people of Malaysia and Java, first described in the 1516 text The Book of Duarte Barbosa, which was translated to English by Henry E. J. Stanley.

Etymology from Wiktionary, CC BY-SA 3.0