the fat [is] in the fire

said when an action has inevitable consequences

The idiom "the fat is in the fire" has its roots in the practice of cooking, specifically when excess fat or grease accidentally catches fire. This situation was often dangerous and difficult to control. Figuratively, the idiom means that a difficult or dangerous situation has occurred, and there is no turning back or avoiding the consequences. It implies that the situation has escalated to a critical point where immediate action or resolution is required.

Just so you know, Mom found out you lied to her.The fat is in the fire now, huh?
When the company's confidential information was leaked to the media, the fat was in the fire, and damage control became crucial.
The politician's controversial statement ignited public outrage, and now the fat is in the fire as they face intense scrutiny and calls for resignation.
After the team's star player was injured in the crucial match, the fat was in the fire as their chances of winning the championship dwindled.
When the project's deadline was missed for the third time, the fat was in the fire, and the client threatened to terminate the contract.