Plural second-person pronoun 'you' (informal, often rude). Used among close friends or in aggressive speech; inappropriate with superiors or strangers.
お前ら、また遅刻か？
You guys—late again?
アニメで敵が「お前らを許さない」と叫んだ。
In the anime the villain shouted, "I won't forgive you guys."
お前らがいなければ成功しなかったよ。
We wouldn't have succeeded without you guys.
先生や上司に向かって『お前ら』と呼ぶのは失礼だ。
Calling a teacher or boss 'omaera' is rude.