hole in the wall
n.— «Mr Hopwood likens the machines to the banks’ automatic teller machines. “Who would want to go back to the days of having to queue in the bank during the limited hours they are open, when you can get cash immediately from the hole in the wall?” he asks.» —“Plastic Money, Instant Films” by David Frith Sydney Morning Herald (Australia) Jan. 30, 1989. (source: Double-Tongued Dictionary)
Further reading
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While reading Great Expectations (Bookshop|Amazon) by Charles Dickens, a listener in Arlington, Texas, is surprised when one of the characters inherits some money, which Dickens describes as a cool four thousand. Were they really using cool that way...