In the picture the man is 'foaming at the mouth.' What does this mean?
Foam at the mouth: to be extremely angry.
This idiomatic expression comes from describing animals and people who have rabies—a viral disease that causes paralysis. This virus attacks the animals throat and jaw muscles until they can no longer swallow. This causes the animals to drool (the saliva drips out of their mouth) and this can be called "foaming" at the mouth. (Foam is a mass of small bubbles in liquid).
Since the rabies virus attacks the brain, animals with rabies often behave strangely and aggressively and try to bite people and other animals. It's as if the animals are very angry and this is how the idiom originated.
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Main Idioms Page
Foam at the Mouth Idiom