It originates from rabies. Rabid dogs foamed at the mouth.
When dogs get angry foam come to their mouths
Actually this is an idiom, it means To misspeak; to say something embarrassing or wrong. ex:- I really put my foot in my mouth during the interview.
This is called purge - postmortem evacuation of any substance from an external orficie of the body as a result of pressure.
To be exposed
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Origin: In the 1500's, a lot of people owned cows and sheep. These are animals that chew their cuds (food that is spit up from the stomach to the mouth and chewed again). It is a long process.
Origin "up a storm"
Foam WillAnd rabies!
No
Hogs will foam at the mouth when they are overheated. This is also a sign of rabies, however, this is a rare condition in pigs.
Yes.