Meaning
A declaration that someone is one's sole and exclusive love — the only one who matters. It stresses faithfulness and uniqueness, asserting there is no one else who compares or competes: 'yuh a mi one an only' is a pledge of devotion. Tender and romantic, it belongs to love songs, sweet talk, and vows, drawing on the plain force of 'one and only' to name the beloved as singular and irreplaceable in the heart.
Examples
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A yuh a mi one an only, nuh badda doubt dat.
You are my one and only, don't doubt that.
'A yuh a' fronts and emphasises 'you' as the sole love.
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Mi nah look no one else, yuh a mi one an only.
I am not looking at anyone else, you are my one and only.
'Nah look' is the negative continuous, meaning am not looking at.
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From mi meet yuh, yuh tun mi one an only.
Since I met you, you became my one and only.
'Tun' means turned/became; 'from mi meet' means since I met.
Origin
From the English phrase 'my one and only', kept intact in meaning with the Patois possessive 'mi' and the reduction of 'and' to 'an'.
How it’s used
A strong statement of devotion and exclusivity, used to reassure a partner of one's loyalty. It carries more commitment than 'sweetheart' and is fitting for serious relationships or public declarations of love.