Meaning
Children's make-believe game of 'playing house' with dolls — and, figuratively, an unserious relationship treated like a game. 'Dis a nuh dolly house' means 'this isn't a game / take this seriously', warning that real life and real relationships are not pretend.
Examples
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Di pickney dem a play dolly house inna di yaad.
The children are playing house in the yard.
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Marriage a nuh dolly house, it serious.
Marriage isn't a game of playing house, it's serious.
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Him treat di relationship like dolly house.
He treats the relationship like a childish game.
Origin
From children 'playing house' with dolls; extended figuratively to warn that a real relationship or situation is not a pretend game.
How it’s used
Literal children's game and a figure for an unserious relationship. 'A nuh dolly house' = this is serious.