Informal, mildly affectionate or exasperated slang for a bratty grandchild. The derogatory edge is typically playful rather than genuinely harsh — grandparents often use it with fond frustration. Formed on the pattern of 'grandkid' but substituting a loaded noun. Rarely deployed in earnest hostility; the humor is usually the point.
'My little grandbrat ate all the biscuits again before I even got to the kitchen,' she laughed.
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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.
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(slang, derogatory) A bratty grandchild.
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