Cold pig: 啥意思呢？“冷猪”吗？用脚趾头想都知道这不是正确答案。

看看解释吧：

To give cold pig is a punishment inflicted on sluggards who lie too long in bed: it consists in pulling off all the bed clothes from them, and throwing cold water upon them.
简单说来就是以一种粗暴的方法把睡懒觉的人弄醒。