Meaning
A steady, committed common-law partner — the person one 'keeps' house with and is faithful to, short of formal marriage. 'Mi keeper' means my long-term partner, and to have a keeper is to be in a serious, live-in relationship, distinct from a casual fling or a 'sweetheart'. In a society where common-law unions are widespread and lasting, the keeper holds a place of real standing and commitment, and the word names the settled, faithful partner of a household not sealed by a wedding but no less binding for it.
Examples
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She a mi keeper, wi live together five years now.
She's my partner, we've lived together five years now.
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Him settle dung wid a good keeper.
He settled down with a good common-law partner.
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A keeper different from a passing ting.
A steady partner is different from a passing fling.
Origin
From 'keep' (to keep house / keep a partner) — one's committed live-in partner in a common-law union.
How it’s used
A committed common-law partner; 'living together' is a very common form of Jamaican union. Distinct from a spouse.