宅(zhái) to stay at home all day

Where does it originate from?
The saying of "宅(zhái)" refers to a group of people who indulge in something excessively, such as computer games, and cartoons. These people would rather stay at home than go out.

What does it mean?
This word means house or residence in Chinese. It became popular on the Internet and has been widely used by young people in the mainland. In China, people give "宅(zhái)" a new meaning. They use it to describe those who seldom go out but stay at home all day. They usually rely on the Internet to connect with the outside world. They can stay at home for several months at a time. It can also be used to describe people who are very stubborn. Later, people invented two additional popular words using "宅(zhái)." One word is "宅男(zháinán)," which means a male who likes staying at home and hardly takes part in social activities. The other one is "宅女(zháinǚ)," the female version of "宅男(zháinán)."

How to use it?
Examples:
e.g. a.他很宅。(Tā hěn zhái.)
           He always stays at home all day.
           You can use this sentence to describe someone who stays at home all day and doesn't like
           going out.
       b.他是一个宅男。(Tā shì yī gè zháinán.)
           He is always staying at home.
           When you want to describe a man who likes staying at home, you can say this sentence.
        c.他的老婆是个宅女。(Tā de lǎopó shì gè zháinǚ.)
           His wife is always staying at home.