I tested the search terms I thought might be useful, and apparently "walla walla" is the technical term for background mutterings in theatre/radio/film.
For what it's worth, most of the non-food references when I didn't use something like "walla walla" or "foley" referred to peas and carrots as slang for things or people that work well together. "They go together like peas and carrots."
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For what it's worth, most of the non-food references when I didn't use something like "walla walla" or "foley" referred to peas and carrots as slang for things or people that work well together. "They go together like peas and carrots."
no subject