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Adj.

1. Lacking physical or mental coordination.
2. Lacking planning, method, or organization.

In other words: Anyone, but usually a girl or funboy who has the inability to kick a football or throw a ball without looking like a complete retard.
While playing golf in your front room your mate puts the ball through your mums brand new double-glazed windows at which point you say "are you unco or what?"

After noticing a drunken lass has her mini skirt tucked into the back of her g-string and is presenting her ass cheeks to the rest of the world you turn to your mates and say "that lass is well unco"
Unco by yyan December 28, 2005
Uncoordinated ... n00b ... pwned regularly in gaming.
Pixie is UNCO.
Hell Salo IS NOT UNCO.
Unco by Hell Salo November 9, 2005
One who is lacking in any form of coordination whatsoever
Hell Salo is UNCO
Unco by pixie January 21, 2003
A company that is smart and usually goes with the popular trend.
Unco Tech and Business Solutions is the best business consultancy firm you can ask for.
Unco by Detectivedink November 25, 2021
sum 1 hu is so bad at catching, throwing, kicking, playing basketball, etc.
if a person were to kick a ball and the ball goes in the other direction yiu say...

wat a fucking unco nigga
unco by uncofrog August 27, 2006
the was an unco moment
Unco by muf4sa November 22, 2021