Gangnam Style: What does it mean?

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Rapper Psy has become the first South Korean pop star to make it to the top of the UK singles chart with his song Gangnam Style.

The track has become a global phenomenon and the video featuring his famous horse-riding dance is YouTube's most "liked" of all time, but does anyone know what Gangnam Style actually means?

The BBC's Lizo Mzimba has been investigating the story behind the sensation.

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