A person who loves boating or spends a lot of time on boats, or informal/affectionate term for a small boat.
From 'boat' + '-ie' or '-y' (informal, affectionate, or diminutive suffix common in English), creating a casual, friendly version of the word.
The suffix '-ie' transforms words into casual, friendly versions—'boatie' sounds fun and approachable, which is why it's used in casual contexts and especially in Scottish and Australian English.
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