チーマー

noun

roving gang of juvenile delinquents

Refers to groups of young people, often teenagers, who gather and roam city areas, sometimes engaging in petty crime or antisocial behavior. The term is wasei-eigo from 'teamer' and is specific to Japanese youth subculture.

wasei-eigo (Japanese-coined English), from teamer

• 夜よるの繁はん華か街がいにはチーマーがたむろしていることがある。

  At night, groups of juvenile delinquents sometimes hang around the entertainment district.

• 彼かれは中ちゅう学がく生せいのとき、チーマーとつるんでいたらしい。

  Apparently, when he was in junior high, he used to hang out with a roving gang.