The following should only be used with close friends, if ever. Also remember that it is more common for men to use these expressions than women.
可以的话，下面这类只能对最最亲密的朋友说。记住一般男士比女人更常用这类表达。
Shit
Example: Man, wheres the can, I need to go shit.
例子：喂，卫生间在哪，我要去拉大便。
Dump
Example: He went to take a dump.
例子：他去拉大便了。
Shitter
Example: Ive gotta [got to] use your shitter.
例子：我要用下你马桶。
Piss
Example: We drank a lot of beer and now we all have to piss.
例子：大家酒喝多了，目前要去小便。
Pisser
Example: Mind if I use your pisser?
例子：不在意我用下你卫生间吧?
Piss oneself 尿裤子