Meaning
'Wen water throw weh, it cyaa pick up' — once water has been thrown away, it cannot be gathered back up. Some things, once done or said, cannot be undone, the proverb warns, so think carefully before you act or speak. Just as spilled water soaks away beyond recovering, a hasty word, a broken trust, or a rash deed cannot be taken back, and the saying counsels care and forethought, since there is no reclaiming what has already been let go.
Examples
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Watch wah yuh seh inna anger; wen water throw weh, it cyaa pick up.
Watch what you say in anger; some words can't be taken back.
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Him regret it now, but wen water throw weh, it cyaa pick up.
He regrets it now, but what's done can't be undone.
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Think first — wen water throw weh, it cyaa pick up.
Think first — once it's done, there's no undoing it.
Origin
A plain image: water flung on the ground soaks away and cannot be scooped back into the vessel — as a hasty word or deed cannot be recalled.
How it’s used
A caution to think before acting or speaking, since some things cannot be reversed.