求翻译第一句~~jack it to sth 是什么意思

Today, I was jacking it to some pretty intense porn on my Macbook. I unplugged the second monitor so I could lie on my bed. Instead of defaulting to the screen, Airplay somehow synced it to the living room TV, where the rest of my family was watching a movie. FML

噗，这段英语真是奇葩。。
没有见过jack作动词用，但猜测大意和checking差不多
我今天在我的苹果笔记本上看一些激烈的色*情片

写错了把

你好！ was jacking it to do 被顶做的意思 如有疑问，请追问。