A donger is the penis of any mammal. It doesn't have to be a particular size, or shape. It just has to be a penis.
Because of this vagueness, when the word is used in conversation, it's usually accompanied by one or more adjective(s) which serve to illustrate which particular donger is being referred to.
1:
Sally: That Kevin is a wimp, y'know
Tracy: Yeah. He can be. But his huge donger makes up for that.
2:
Aussie 1: Jeez, 130 degrees is a bit warm. I'm going down the pub to get a beer.
Aussie 2: I'll join you, mate. I'm as dry as a dead dingo's donger.
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