A gonnie is a person who is mentally challenged, they struggle to do many simple tasks. It can be hard to spot a gonnie as their exterior is normal, however, delve a little deeper and participate in a conversation with them and their true gonnieness is quickly revealed. Common signs of being a gonnie range from general slowness, being inept at hand eye coordination activities, poor spelling and grammar and an often vacant expression.
'Hey, you see Abbie only scored a 3 letter word on countdown?' 'I know, she's such a gonnie'.
by Smeegul August 11, 2013
Australian Slang for a large Pebble usually
He threw a big Gonnie at me. There was a Gonnie down the drain pipe.
by Kezza1079 August 12, 2014

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