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."
I think 'rhubarb' is more common for mindless chatter, but you sometimes hear peas and carrots still. One person I knew was convinced it was cockney rhyming slang, "peas and carrots, parrots". I could never convince her that her grandfather had LIED TO HER. Grandparents should stop lying to people.
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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."
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I think of what Hawkeye and Trapper John filled Frank's foxholes* with in There Is Nothing Like A Nurse.
* Master of unintentional alliteration!