The phrase "coin op" means something that operates or works when you insert a coin. It is commonly used to describe arcade games or machines that require coins to play or use. Full definition
Common coin op W / D in located building 200 1BR / 1BA condo with split king bed (can be set up as a king bed OR 2 twins), queen sofa sleeper and full kitchen. (wyndhamvacationrentals.com)
I dared to suggest that Mankind's greatest accomplishment, his longest lasting legacy, was to have successfully converted Taito's coin op Chase HQ to the ZX Spectrum.» (gamesetwatch.com)
However, what really differs Sega's Joypolis from any other amusement park in the world is the technology involved in its avant gardè coin ops contained within, with all the biggest and best editions in residence. (t3.com)