Normally it’s achieved by doing exactly what it says. Ruin the orgasm. Common ways are to edge up and make it a strong orgasm and just as you slip over the edge stop all stimulation. Another method is to hit genital area as the orgasm starts. Any pain really. Assuming one isn’t masochist. So hitting clamping burning wax etc. anything to remove your mind from the pleasure.
If you’re doing it with a partner. You can restrain them and edge them and same as they cum use a way to interrupt it.