A warm, informal British and Australian term for grandmother — essentially swapping the American 'grandma' for the UK/AU preference of 'mum' over 'mom'. Grandmum sits comfortably alongside 'gran', 'nan', and 'nana' in the rich ecosystem of affectionate grandmother terms across English-speaking cultures. It has a slightly more formal feel than 'nan' but is still genuinely cosy and loving. You'd use it when introducing her to someone new or writing about her in a heartfelt context.
Every Sunday without fail, we'd head over to grandmum's for a roast and a catch-up.
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(UK, AU) Grandmother.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.