What does the boy mean by ng?

NG is the abbreviation of the English word "notgood", which means "bad" or "no" in Chinese. In spoken English, ng can also be used to express dissatisfaction or negation of something, similar to "no" or "bad" in Chinese.

For example, if a boy dates a girl, but the boy doesn't behave well during the date, he may be uncomfortable, nervous or don't know enough about the girl. At this time, the boy may say, "It's uncomfortable to go out for dinner tonight, and I feel ng."