The following are appropriate with family or friends:

下面为跟朋友或家人在一起时用法：

Pee

-Example: Where' the bathroom? I need to pee.

例子：洗手间在哪？我想小便。

Tinkle (mostly used by older women)（用于年龄大的妇女）

-Example: I drank too much water! I have to go tinkle.

例子：我水喝太多了！我得去小个便。

Go (when used in context)（根据语境）

-Example: Where's the bathroom, I really have to go!

例子：厕所在哪，我得上趟厕所。

Potty (Generally used by children)（通常用于儿童）

-Example (noun): Where's the potty?

例子：便壶在哪？

-Example (verb): Mama, I have to potty.

例子：妈妈，我要尿尿。

Take a #1/#2 (number 1 refers to peeing, number 2 to pooping)

1号表示小便，2号表示大便。

-Example: Person 1 – I have to go to the bathroom.

例子：人物1-我得上趟厕所。

Person 2 – Number 1 or number 2?

人物2-大号、小号？

My bladder is bursting (when you really have to go)（真的憋不住时用）

-Example: Stop the car! My bladder is bursting.

例子：停车！我憋不住了。