what 's AA制 mean? going dutch

“AA制”，就是大家一起吃饭，买单的时候各付各的。
如果我给一个朋友打电话，说“我们一起吃饭吧”，那么，这顿饭有可能 是我请客，也有可能是朋友请客。如果我说“我请你吃饭”，或者我说“今天是 你的生日，我请你吃饭吧”，那么就是我请客买单。如果我说“我们见见面，吃 次西餐”，那就不清楚了。大家可能就要各付各的。几个朋友在一起，或者两 个人不是很熟，也都是各付各的。
中国人在请客吃饭时，有时也是“AA制”。这种“AA制”常常不是在一 次吃饭以后每个人买自己的单，而是今天我买单，明天你买单；这次我请客， 下次你请客。

Yes, it means split the bill.

Just split the total amout of money you spent , average unit

AA制 ，自己付自己的钱。中国人，这次他请客，下我请客。

“go Dutch” is a foreign rule, which is popular in foreign countries.
The orginal intention is to pay for their own consumpition after eating in a restaurant.
“AA制” comes from English go Dutch.
But in China, "AA制“mostly means share equally what we do.
There is a little different compared with go Dutch.
For example, three people eat hot pot at a restaurant totally spend 150rmb, this cost need to AA payment，so each person pay 50rmb.