International rap superstar Flo Rida and his management have been ordered to pay more than $400,000 to the organisers of Newcastle's Fat As Butter festival over his notorious no-show at the event last October.

The 32-year-old singer, whose real name is Tramar Dillard, infuriated 11,000 fans at the $110-a-ticket event when he told organisers, minutes after he was due to go on, that he would not be performing.

Flo Rida.

"Flo Rida has slept in and will not be able to make the concert," organisers told the waiting crowd.

"We think he will still be able to do the Mounties concert, but may have difficulty attending."