Meaning
To let go, release, or set loose — a run-together of 'let go'. 'Leggo di bwoy' means release the boy, and 'leggo mi hand' is let go of my hand. As an adjective, 'leggo' means wild, loose, and uncontrolled, as in a 'leggo beast' — an unruly, out-of-control person or animal that has broken free of all restraint. So the word runs from the plain act of releasing to the state of something let loose and running wild, no longer held or governed by anyone.
Examples
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Leggo mi hand!
Let go of my hand!
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Dem leggo di dog inna di yaad.
They let the dog loose in the yard.
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Him a gwaan like a leggo beast inna di dance.
He's carrying on like a wild, out-of-control person in the dance.
Origin
A contraction of 'let go'; the 'leggo beast' sense pictures an animal turned loose to run wild.
How it’s used
Verb 'let go/release'; adjective 'leggo' = wild/uncontrolled, esp. 'leggo beast'.