Meaning
'Full of mouth' — all talk: boastful, loud, forever running commentary or big promises with little behind them. A 'full a mout' person talks plenty and does little, close to 'bagga mout' and 'blabba mout'.
Examples
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Him full a mout but him cyaa back it up.
He's all talk but can't back it up.
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Too full a mout, always a chat.
Too mouthy — always talking.
Origin
'full of mouth'. See [[bagga-mout]], [[blabba-mout]].
How it’s used
All talk/boastful; talks plenty, does little.