"borborygm : (medicine, physiology, rare) A gurgling or rumbling noise produced by gas in the bowels;..."

“borborygm : (medicine, physiology, rare) A gurgling or rumbling noise produced by gas in the bowels; a borborygmus.
(figuratively) A gurgling or rumbling.
Today is designated by the United Nations as World Toilet Day to draw attention to inadequate sanitation facilities in countries around the world.”

- https://en.wiktionary.org/wiki/borborygm#English

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