Meaning
Backing, support, or reinforcement — the people, resources, or muscle standing behind someone. To 'have backative' is to have solid support to rely on, whether money behind a venture, a crew behind a man, or influence behind a claim, so that one is not standing alone. The word names the strength that comes from what is at your back, and to move without backative is to be exposed and unsupported, while good backative gives a person the confidence and force to press their case.
Examples
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Him talk big because him have backative.
He talks big because he has backing behind him.
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Yuh cyaa start dat widout backative.
You can't start that without support.
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Har family a har backative.
Her family is her support.
Origin
Built from English 'back' (to support) plus an '-ative' ending, a Jamaican coinage for the idea of backing or reinforcement.
How it’s used
Can mean respectable support (family, savings) or, in tougher contexts, the force behind a person. Context sets the tone.