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(young) hoodlum; delinquent boy; delinquent girl; hooligan; punk
small-time yakuza
brat; little shit
夜道でチンピラに絡まれた。
I was accosted by a punk on a night street.
駅前にチンピラが集まって騒いでいる。
Punks are gathering in front of the station and making a ruckus.
チンピラ風の男が、店で店員に因縁をつけていた。
A punk-looking man was picking a fight with a store clerk.