Homebody. it's best to say Homebody. someone who says at home and is lazy, you can say is a couch potato. Someone who stays at home and is always on computer is a nerd. Make sense? Easy way to think of it is their body is at home: homebody. Sorry for the repeat, clicked comment instead of answer

宅男：otaku, nerdy guys 宅女：otaku girls

I think jane's answer is closer to the mark. In addition to nerdy you could also say geeky.

I translate like this: Now,many young people like to stay at home,and become couch potatos

Homebody. it's best to say Homebody. someone who says at home and is lazy, you can say is a couch potato. Someone who stays at home and is always on computer is a nerd. Make sense? Easy way to think of it is their body is at home: homebody.