Meaning
'Baan bak a cow' — born behind a cow, that is, of humble, rural, country origins. Said of someone raised in the deep countryside among the farm animals and the provision ground, it can be a plain statement of humble roots or, more sharply, a dismissive jab implying a person is unsophisticated and lacks town manners and polish. It plays on the old town-versus-country divide, and where a proud country person might own it, in another's mouth it is a put-down of the supposed backwardness of rural upbringing.
Examples
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Nuh laugh after mi country ways — mi baan bak a cow an proud.
Don't laugh at my country ways — I'm of humble rural stock and proud of it.
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Him act like him nuh have manners, like him baan bak a cow.
He acts like he has no manners, as if he was raised in the bush.
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Plenty big people baan bak a cow an rise up.
Plenty of successful people came from humble country origins and rose up.
Origin
A literal image of rural birth — brought into the world in the yard behind the cattle — standing for deep-country, humble beginnings.
How it’s used
Can be worn with pride (humble roots) or used dismissively (unsophisticated). Tone decides which.