Dialectal or informal shortening of 'aft' (the rear section of a ship); or a casual exclamation expressing dismissal or annoyance.
From Old English 'æft' meaning 'behind' or 'stern' (of a ship). Used in nautical terminology, with dialectal variations in spelling and pronunciation across regions.
Nautical terms are wonderfully preserved in English—'afft' or 'aft' comes from Old English and has meant 'the back of the ship' for over 1,000 years! Maritime vocabulary is some of the oldest in English.
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