Plural of loo; British slang for bathrooms or toilets.
From a mysterious origin—possibly from 'Waterloo' (a brand of toilet paper), French 'l'eau' (water), or a contraction of an old term; it's thoroughly British slang that emerged in the early 1900s.
Different English-speaking countries use different toilet words—Americans say 'bathroom,' Brits say 'loo,' Australians say 'dunny,' and Irish say 'jacks'—showing how the same necessary bodily function gets hidden behind completely different coded language depending on where you're from.
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