拉 means poop ，it literally means pull，because you need to pull you sh*t out.撒 means pee, it literally means release, because you need to release you pi*s out. 吃喝拉撒 means all the thing to keep you live

吃喝拉撒不可以拆开 这里指生活中的琐事

It means urinate and defecate.

go to WC