A retarded (or severe brain injury) first nations person that is indigenous to any land, who has never been in civilization or seen white people before
As were driving down past the canal we could see the Nong nong sitting on the bank of the river, urinating in his own mouth while the rest of the tribe threw rocks at him, making him the village idiot.
in Australian slang, nong is used as a pretty mild and/or endearing insult. a bit of a twit, or idiot. nothing too mean or horrid is meant by calling someone a nong.