Plural of 'chickie,' an informal or affectionate term for young women or girls, sometimes used in a playful or slang manner.
From 'chick' (slang for a young woman, from chicken metaphor) plus the plural '-ies' ending. The term 'chick' became popular slang in the 20th century, borrowed from the chicken reference but applied humorously to people.
The evolution of 'chick' from an actual young chicken to slang for women shows how language constantly borrows from animals to describe people—we say 'fox' for someone attractive or 'turkey' for a flop movie, which proves humor and metaphor are how language grows and changes.
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