Plural of chummy; multiple close friends or roommates.
From 'chum' with the adjective suffix '-y' (meaning friendly) pluralized into a noun. Represents how 'chummy' can function as a noun meaning a chum or friend when used casually.
In British slang, 'chummies' was a casual word for your group of close friends, showing how the most intimate social bonds get the most reduced, friendly-sounding language.
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