N'importe quoi is a very peculiar expression in French.
N'importe quoi = "anything"
The original meaning of n'importe quoi is "anything", but it's not the most common use of it.
Pour toi, je ferais n'importe quoi!For you, I would do anything!
(main meaning) N'importe quoi = "nonsense"
It is most commonly used to express a lack of understanding at a situation. It is actually closer to "nonsense".
It is a very difficult expression to translate to English, as it can be translated differently depending on the context.
Regarde-le! Il fait n'importe quoi!Look at him! He's being silly / He doesn't know what he's doing!
Pfff! N'importe quoi! Pfff! Nonsense!
Tu dis n'importe quoi!You're talking nonsense / You don't make sense!
Note that 'n'importe quoi' is a very common expression.
See also the related lesson: Autre chose / quelque chose d'autre = Something else (indefinite pronouns)
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