Unluck generally means unlucky, though isn't said in the same way. It's normally just an outburst.
"Shit, I broke my leg."
"UNLUCK!"
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My brother was unluckful when he didn't get ice cream for 35 years!
A shortening and informal use of the word unlucky.
When you're about to win a victory royale in fortnite but get sniped by a 12 year old. "Damn man, that's unlucks."