Tap out is a gambling term that refers to a player losing their entire bankroll.
Before each session, players decide on the amount of money they are ready to spend or simply play with all the money they currently have on them. Regardless of your preference, the amount of money you decide to play with is called a bankroll.
If you tap out, it means you have lost your entire bankroll for the night and you cannot continue, which ends your casino experience for the time being. Needless to say, it’s a term nobody likes to hear, so let’s hope you never have to tap out!