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From the Jamaican Ministry of Information, Culture, Youth & Sports:

Usain Bolt has lit up the Olympic Games with his performances on and off the track. His name rolls off the lips of the locals who erupt into a frenzy every time he performs his antics during race introductions. He has drawn criticism in the media, particularly from American journalists, who accused him of showboating and being disrespectful to his competitors by celebrating even before the races have been run. ...

Usain has been performing the Jamaican dance move "Nuh Linga", made popular by dancehall artiste Elephant man while he prepares in the blocks. The term "Nuh Linga" in Jamaican parlance means not to loiter or hang around and Usain has been showing that he's a man in a hurry to secure a permanent place in the history books by winning three sprint gold medals at one Olympics.