Colloquial plural 'you' (you guys); a casual, often blunt or rude form of addressing multiple people.
あんたら、何やってるの？
You guys, what are you doing?
そんなこと言うんじゃない、あんたらには関係ない。
Don't say that; it's none of your business, you lot.
あんたらのせいで遅刻したよ！
We're late because of you guys!