British slang, particularly from the North of England, meaning to be in a bad mood, sulking, or carrying a visible grudge. If someone has a monk on, they're grumpy, uncommunicative, and radiating negativity — the kind of mood where everything is annoying and you don't want to talk to anyone. The phrase paints a vivid image of brooding silence. It's affectionately used to call out someone's obvious strop without making a big drama of it.
Don't ask Tom about the football — he's had a monk on ever since his team got relegated last weekend.
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(UK, slang) To be sullen or bad-tempered.
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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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