Meaning
A soft, weak, spineless person — a wimp or a pushover, easily bullied or taken advantage of. A 'sapps' has no backbone, giving way under the least pressure, and 'stop act like a sapps' means stop being feeble and stand up for yourself. Related to being 'sappy' or soft, the word is a mocking put-down for the timid and the yielding, a real sting in a culture that prizes toughness, nerve, and the ability to hold your ground and not be run over.
Examples
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Him too sapps, him let dem walk ova him.
He's too soft, he lets them walk all over him.
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Nuh be a sapps, stand up fi yuhself.
Don't be a wimp, stand up for yourself.
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Di bully pick pon di sapps dem.
The bully picks on the weak ones.
Origin
From 'sap'/'sappy' (soft, feeble); a wimp or pushover.
How it’s used
A wimp/pushover. Compare 'maama man', 'dibby-dibby', 'slabba'.