(slang) A customer.
So when everyone was stopping at the grocery store for one or two things on the way home from work, inundating each express lane with at least ten custies, the cashier on the express lane was due for a break
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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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