(someone) is toast

Translations
(кто-то) попал в беду
If you don't finish the report by tomorrow, you're toast.
Если ты не закончишь отчет до завтра, ты попал в беду.
Definitions
This phrase means that someone is in serious trouble, likely to fail, or about to face negative consequences. It is often used informally to indicate that a person has no chance of avoiding a bad outcome.