extremely violent, wild, or frightening: a savage dog/beast.

When savage takes the form of a noun, it means "a brutal person," and when it's a verb it means "to attack ferociously." Any way you use it, savage is uncivilized and violent. Definitions of savage. adjective. without civilizing influences. “a savage people”

Beginning in about 2008, the term became an American slang term meaning "bad-ass, cool, and violent".

a fierce, brutal, or cruel person. a rude, boorish person. Synonyms: oaf, churl. Disparaging and Offensive. a member of a preliterate people or society regarded as uncivilized or primitive.