Stepmummy is the informal, affectionate British and New England term for a stepmother — the version children use when they're young enough to still say 'mummy' rather than 'mum' or 'mom.' It carries a soft, familial warmth that reflects the changing nature of modern blended families. Unlike the fairytale connotations of 'stepmother,' stepmummy is intimate and often used by children and adults alike when speaking fondly of a close parental relationship formed outside biology.
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UK and Irish slang — Cockney, Scouse, Geordie, Yorkshire, Glaswegian, Brummie, Welsh, West Country, plus Irish English. Centuries of regional dialects feeding into modern British and Irish street talk.
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She'd always called her stepmummy by that name, even after she turned thirty.
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(UK, New England, informal) stepmother.
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