Green’s Dictionary of Slang

1. (US Und.) executed in the electric chair.

1949

Monteleone Criminal Sl. (rev. edn).

2. (US) physically or mentally exhausted.

1995		S. Moore In The Cut 63: I have many more words for the dictionary [...] toasted, burned-out (as in ‘he’s been a detective too long; he’s toasted’).
2000		N.Y. Times 27 June n.p.: Most people now know that [...] ‘Spam’ is no longer a ham product but a form of computer junk-mail; ‘toast’ refers not to a breakfast choice but to a state of being dead or burned out [...].

3. tipsy, either slightly or extremely drunk.

1980		Eble Campus Sl. Spring 6: toasted – drunk.
1993		Tarantino & Avery Pulp Fiction [film script] 77: Three well-dressed, slightly toasted Mexicans.
1997–2000		Da Bomb 🌐 29: Toasted Drunk; intoxicated.
2006		G. Iles Turning Angel 115: Ellen’s so toasted, she can barely walk.

4. (drugs) intensely intoxicated by a drug.

1980		E. Folb Runnin’ Down Some Lines 176: Another picture is that of being cooked or overdone – toasted, fried.
1993		Eble Campus Sl. Oct.
2005		J. Stahl I, Fatty 214: The once-vivacious beauty was so toasted on coke.