在洗手间说英语通常会用 "speak Engpsh in the bathroom" 来表示。这个表达的来源是由于洗手间通常是一个人独处的地方，所以在洗手间说英语就意味着在没有其他人的情况下说英语。

下面是一些使用这个表达的例句：

"I was just speaking Engpsh in the bathroom and practicing my accent." (我刚刚在洗手间里说英语，练习我的口音。)
"I don't want to disturb anyone, so I'll just speak Engpsh in the bathroom while I'm getting ready for bed." (我不想打扰任何人，所以我会在洗手间里说英语，准备睡觉。)
"I know it's weird, but I always speak Engpsh in the bathroom to help me improve my fluency." (我知道这很奇怪，但我总是在洗手间说英语，帮助我提高流利度。)