Irish informal term for someone who is excessively, almost ostentatiously pious — the kind of person who attends every church service, quotes scripture in casual conversation, and judges others' moral choices from a great height. 'Holy Mary' has a definite critical edge to it; it's not a compliment. It suggests performative religiosity rather than genuine faith. The phrase is deeply embedded in Irish Catholic culture, where suspicion of over-the-top holiness is practically a social tradition.
Don't invite her — she's a bit of a Holy Mary and will spend the whole night disapproving of everyone.
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(Ireland, informal) One who is extremely pious.
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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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