What is the meaning of "pull somebody's leg" ?
Is that true or are you pulling my leg?

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Hi Jesús,

The phrase is used to describe teasing someone or cracking a joke with someone.

Example: 
John: Hey, your pants are unzipped!
Tom: Oh dear! 
John: Relax! I was just pulling your leg.

Hope this helps.
Cheers, Lance

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http://dictionary.cambridge.org/dictionary/english/pull-sb-s-leg

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to pull somebody's leg - "tomarse el pelo"

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It means to joke or to kid around with someone.