What does nah agh mean?

Answer 1

It sounds like the slang or street version of 'no', sometimes sounding like 'uh uh', or 'nuh uh'. It is a word some English speakers use without giving it a thought, and English speakers know what it means. But it would be very inappropriate where you would like you speech or writing to be taken seriously.

If it is a word in a language other than English, you are required to give the language of the word of phrase when asking for a translation.