OCUD (Obsessive Cellphone¹ Use Disorder) describes a person who continually² talks on their cellphone in public, while driving, checking out, or eating in a restaurant.

OCUD（全称Obsessive Cellphone Use Disorder，手机过度使用症）指一个人一直在用手机打电话，无论开车、出门或是在餐馆吃饭，都一直在打电话的状态。

For example:

I wish that lady would get off her cellphone and watch the road. Gosh, she must have OCUD or something.

我真希望那位女士能放下手机看着点路。天啊，她一定得了手机过度使用症啥的。