What's the meaning of the expression "nada que ver"?

Question

• What's the meaning of the expression "nada que ver"?
• In which countries is used?

Here are some examples:

1. Lo que dices no tiene nada que ver con lo que estamos discutiendo.

2. Conversation between Carlos and Juan. Both live in Mexico.

Juan: Fuiste de vacaciones a Europa?

Carlos: Nada que ver, fui de vaciones a Cancún (Mexico).

Answer 1

I believe the phrase "nada que ver" is used in different countries. I'm from Perú and we normally use that phrase to represent "You're talking nonsense!". For example:

Your friend: "I saw you kissing my sister last night"

You: "No, you're talking nonsense!" (No, nada que ver!)

But it also has other meaning like in your example:

Lo que dices no tiene nada que ver con lo que estamos discutiendo.

What you are saying has nothing to do with this discussion.

Or with your second example:

Juan: Fuiste de vacaciones a Europa?

Carlos: Nada que ver, fui de vaciones a Cancún. (No, you're wrong, I went to Cancún)

Answer 2

It usually means:

There is no relationship between what I've just stated and your answer.

Answer 3

from modern Chilean usage:

"You are wrong."

Answer 4

In spanish from Spain, a meaning is "nothing to do":

Eso no tiene nada que ver con lo que estábamos hablando.

Another one is: "It's totally different":

El restaurante al que hemos ido no tenía nada que ver con aquel al que fuimos el martes. Era mucho mejor!