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2.
An insult for an Idiot or a fool.
If somebody does something stupid or screws up on something easy, they would be known as a Goondog.
'Oh, You Goondog!'

'Goondog, Goondog, Goondog' *Chanting*

'Dumb ass Goondog.'
by Luke Blunt August 29, 2007
 
1.
People who are known to consistently consume goon are colloquially known in Australia as Goon Dogs. Such people often claim to actually enjoy the taste of the boxed wine, thus usually making them masters of Goon of Fortune.
"Fuck me, Andrew is such a goon dog"
by Andrew (sixPAC) Turnbull July 02, 2006