roughneck; rowdy person; hooligan
Refers to a person who is violent, unruly, or prone to causing trouble. Often used for brawlers or troublemakers.
He is a well-known roughneck in town.
Those hooligans caused trouble again.
Compound of 暴れ (abare, the continuative form of 暴れる 'to act violently') + 者 (mono, 'person').