1）“零零几的车牌” I am not sure the context of this expression. But I can give you another example, if people say "O字头的车牌", it implicitly means that the car belong to local government, also it means these vehicles have high priorities than other cars. Might “零零几的车牌” has some specific meaning in certain context. 2） “越绕越糊涂” it means someone want to explain something to you. But the more she or he explain to you, the more confused you are. 3）“聚众殴打” I think it simply means fight in group. For example, after a party, two group fight each other for something.

越绕越糊涂 = the more you turn (spinning around), the more confusing you become 聚众斗殴 = to round up a group for a brawl.

1. "零零几的车牌" are vehicle license plates that start with 00 (zero-zero-something), ie 00123, etc. 2. 越绕越糊涂 意思是说你越是转来转去，绕来绕去，你越感到迷惑。 3. 聚众殴打 这词组我本身没用过。一般是说 "你找来一群人和你一同去殴打另一个人"。反正就是仗着你人多去殴打人数较少的另一方。