What is it called when someone copy what you said?
I knew that word but suddenly I forgot and it's just so frustrating! So what is it called when someone copy what you just said to make fun of you?

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When you copy what someone else said and they way they are speaking it is called to mimic.  It is usually done just for fun or to annoy the other person.

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pirate , mimic , free rider , copycat 
depends upon his intention

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Could also be impersonate.

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Parrot =))

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You can also say that person is being a copycat.

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