非正式表达 you're toast 的意思是“你完了”，多用来表达警告之意。这个表达也可以用来表示某物被毁灭了 something is toast。
If you make a mistake in your monthly report again, you're toast! You really have to be more careful.
He crashed his car last week and completely destroyed it. It was toast.
Toast 做动词还有“祝酒、敬某人一杯”的意思，to toast someone。
Let's toast our wonderful assistant, Phil. He's worked really hard this year and his sense of humour has kept everyone going through a difficult time. To Phil!