There are a number of ways that this dark pattern can be used, but they all rely on spending money to skip over something in the game that you don't want to do.
1) You may have a limited amount of "energy" or "turns" that you can use before you are no longer allowed to play the game. You then have to wait for that energy to recharge, or you can pay to instantly recharge it.
2) You may start an activity in a game (building, researching, hunting, etc) and the game starts a timer that indicates how long it will take for this activity to finish before you can collect the rewards. You have to wait, or you can pay money to skip the timer and collect the rewards right now.
3) The game show you advertisements
, but will allow you to spend money to skip the ads. This is how you can trade money for your attention.
In these examples, a game designer intentionally puts an undesirable blockage into the game that prevents it from being played unless you wait or pay money. This causes the player some discomfort which can be overcome by paying money. If the player chooses to wait instead, this turns into a different dark pattern called Wait to Play