Toasted

I keep reading posts on some forums about a person is toast. I need meanings and derivation of 'toast'. I can only arrive that 'toast' is finished. Thanks in advance.

"Finished" is the correct meaning. Declaring a person to be toast means the person is (or, usually, will be) "cooked," done for, all over, washed up.

I've seen the phrase used in contexts where the meaning seems to be that you will be going to hell (where you'll be turned into toast). SS

Just as well that they didn't say 'roast' - a whole new meaning to 'my boss gave me a roasting'...

Just a guess: Could the phrase have begun in police or court jargon and referred to execution in the electric chair?

My guess is it grew out of the schoolyard/sports field taunt "you got burned!", meaning I outran or outmaneuvered you.

I'm not sure whether the phrase existed prior to "Ghostbusters," but it got a huge rise in popularity after Bill Murray looked at the evil goddess on the rooftop and declared "This chick is toast."