Katie wrote:"I believe "frig" used to be a thing."
Inside fruit machines, at the back where there's a locked door, there used to be a set of controls for things like changing the payout rate, easy-play mode or (for pubs) turning the goddamed-repetitive music off. These are officially called "frig switches" and the easy-play (for testing) is hence "frig mode".
That is one of the most convoluted yet entertaining descriptions of the workings of female genitalia that I have read.
For further reference most, er ‘fruit machines’ have another ‘frig switch’ above the coin slot. It will definitely adjust payout and switch to easy-play mode but in all my years I’ve never found it to turn off the repetitive music. Your mileage may vary.