Something or someone classed as tight isn’t usually much fun and doesn’t like to part with anything often, do they? If there’s any confusion about what it means, just think of the opposite, a tight machine. They loiter around looking for weaknesses and try to calculate the probability of when a machine’s about to drop – how loose it is. If so, you might (on occasion) have had some fun stalking loose slots out? Maybe stalking is not the right phrase these days, but that’s what it takes, and lots of people do it.
If you love slots, you’ve probably tried your luck in plenty of bricks-and-mortar games arcades over the years, maybe you’ve had a few trips to live casinos too.