Meaning
Nothing but; only — or, conversely, plenty, a whole lot. Context decides which: 'bare foolishness' means nothing but foolishness, sheer nonsense, while 'bare people deh deh' means there are loads of people there. A very common intensifier of the newer slang, spread widely through British-Jamaican speech, it either strips a thing down to one quality ('bare lies') or piles it up in abundance ('bare money'), and only the sense of the sentence tells whether it means exclusively-one or a great-many.
Examples
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A bare lie him a tell.
It's nothing but lies he's telling.
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Bare people turn out fi di dance.
Loads of people turned out for the dance.
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Di place have bare mango tree.
The place has lots of mango trees.
Origin
From English 'bare' (only/mere), which in Patois also swings to mean 'plenty', much as 'bere' does.
How it’s used
Two senses — 'only/nothing but' and 'plenty/loads' — separated by context. Very common intensifier.