If you were watching The Big Bang Theory this week you would have heard Sheldon explain that the use of toast as a verb dates back to the Romans. I decided to check up on this and I am not so certain.
First, many sites combine this derivation with the “clink the glass to check for poison” lore, which Snopes and other sites deny. If a site started with the poison angle, I distrusted it from there on.
The word toast comes from Vulgar Latin. No doubt there.
The use of toast as a verb shows up first in writing in 1700 according to the OED.
I get the feeling that someone made a leap that they were not justified in making going from one to the other. Does anyone have an authoritative source they can reference?