Meaning
Moody, unpredictable, and inconsistent — friendly one moment and cold the next, reliable only 'sometimes'. It describes a person whose mood or behaviour keeps shifting so that you never know which version you will get, warm today and distant tomorrow. A pointed, slightly weary criticism, 'sometime-ish' names the fickle, changeable character who cannot be counted on to be steady, and it is used with real exasperation of anyone whose affections, temper, or manner blow hot and cold without warning.
Examples
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She too sometime-ish, one day she cool, next day she vex.
She's too moody, one day she's friendly, the next she's cross.
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Him sometime-ish wid di work, yuh cyaa depend pon him.
He's inconsistent with the work, you can't depend on him.
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Mi nuh like how she sometime-ish wid people.
I don't like how changeable she is with people.
Origin
From 'sometime' plus the '-ish' suffix — behaving well or warmly only 'sometimes', hence moody and inconsistent.
How it’s used
A criticism of moodiness and unreliability in a person's temper or behaviour.