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A "crazy nigger". Often used in reference to the alcohol-induced insanity experienced by many Australian Aborigines. Popular amongst the prison population.
My stupid friend, Jimmy (not streetwise): "I'm gonna roll that cheeky fucking boong!"
Me (alert to the way of the street): "Whoa now, Jimmy! That coon is nutty coco!"
*Jimmy takes a cautionary step backward*
by Harriett Marionette August 19, 2006
A popular derogatory term used by Australian youth to mentally demean a person's behaviour to that of a crazy native aboriginal tribesman.
Alex: God Kevin is such a bloody freak!
Simon: If he were any more spastic he'd be a nutty coco for sure!
by Philip Browning August 21, 2006