The concept of "hot" and "cold" slots refers to machines that seem to pay out frequently or not at all

https://www.slideserve.com/esyldapnxk/hyper-spins-online-pokies-examining-the-thrills-and-details-of-hyper-spins

The thought of "warm" and "bloodless" slots refers to machines that appear to pay out continually or by no means, although those tendencies are ultimately random