Bagga mout
Also spelled: bag a mout, bagga mouth, baga mout
Meaning
A person who talks a great deal but does little to back it up; all talk and no action. It can also describe empty boasting or idle chatter itself. Closest to 'big mouth' but carries the specific sense of hollow words rather than just loudness.
Examples
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“Him a pure bagga mout, him neva do nutten yet.”
He's all talk, he's never actually done anything.
Describes someone whose promises never materialise.
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“Nuh badda wid dat bagga mout, come show mi.”
Never mind all that talk, come show me.
'Bagga mout' used to mean the empty talk itself.
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“She full a bagga mout but wen tings get real she gone.”
She's full of big talk but when things get serious she disappears.
'Full a' meaning 'full of' introduces the trait.
Origin
From 'bag of' (a bagful, i.e. a large quantity) plus 'mout' (mouth), literally 'a bag of mouth' — a great deal of talking.
How it's used
Common everyday insult, mildly mocking rather than deeply offensive. 'Bagga' derives from 'bag a' and is widely used to mean 'a lot of' (e.g. 'bagga money'), so context tells you whether it means quantity or the specific 'big talker' sense.