If someone says "you're toast" it means you are, or will soon be, in a lot of trouble. It is often used as a warning.
A physical object can also be 'toast', which means it has been destroyed.
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.
To 'toast' someone is to raise your glass and say a few words wishing them good luck or showing them respect, and then to take a drink together.
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!
This 'painting' of the Mona Lisa was made from over 160 slices of toast. It measures two and a half metres by one and a half metres.
The work was created by Birmingham designer Emma Green, and took three days to complete.