At first, I thought your post was about people
in the theater making chewing noises (which I hate, along with the sound of crinkling plastic wrappers!

)
The annoying chewing by the actors could be described as "chewing scenery," or melodramatic overacting.
Quote:
I never get tired of watching Harry Callahan chomp on that hot dog while blowing punks away.
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I love the scene where Harry yells "Halt!" at the punk, as he sprays him with a mouthful of hotdog bun!