Green’s Dictionary of Slang

(Aus. teen) of a person or object, unco-ordinated.

1993		T. Winton Lockie Leonard: Scumbuster (1995) 127: On top of everything else, love was making him a bit unco.
2003		B. Mellonie Bruce’s Aussie Dict. 🌐 I knew an octopus who was so unco, he couldn’t tell his left arm from his right, from his left, from his right, from his left [AND Additions].