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

COIN SLOT definition and meaning coin slot meaning slang coin slot coin slot body modification There is one meaning in OED's entry for the noun coin-in-the-slot See 'Meaning & use' for definition, usage, and quotation evidence Entry status

coins of fortune slot slot' machines which operate by means of insertion of a coin and which slang expression not accepted as proper English or they wanted to