Replying to @daddy shortlegs good question!! A coinslot is

The Concise New Partridge Dictionary of Slang and Unconventional coin slot slang Coin slot — can refer to: A coin receptacle on a vending machine A slang term for buttock cleavage This disambiguation page lists articles associated with the coin slot couloir Coin Names and Nicknames · Bender

coin slot master Term used to describe a particular style of a girls pussy where the outer lips completely cover the inner parts, leaving only a very thing slot between them