Meaning
An adult male seen as mature, self-reliant, and to be taken seriously — and also a man of status, wealth, or influence. It is both a marker of respect and a standard by which conduct is measured, so it can be plain praise ('him a big man now') or a pointed rebuke ('yuh a big man, behave like one'). To be a big man is to have grown into responsibility and standing, and the phrase carries the whole weight of what it means to be a proper, respected grown man in Jamaican eyes.
Examples
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Yuh a big man now, stop act like pickney.
You're a grown man now, stop behaving like a child.
Rebuke: appeals to maturity expected of a 'big man'.
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Him a big man inna di area, everybody know him.
He's a man of standing in the area, everyone knows him.
Here it denotes status and influence.
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Big man ting, mi keep mi word.
On my honour as a grown man, I keep my word.
'Big man ting' is a set phrase pledging seriousness/integrity.
Origin
A calque-style compound from English 'big' + 'man', where 'big' extends metaphorically from size to maturity and status, a pattern common in Caribbean and West African English.
How it’s used
Informal and mostly male-associated. 'Big man ting' functions almost as an oath. Calling someone a big man can flatter, remind them of responsibility, or sarcastically shame immature conduct depending on tone.