chef’s arse
n.— «It’s bloody hot in here. So you get the condition commonly called chef’s arse, because all the sweat runs off your back and between your cheeks.» —“This much I know” by John Hind Observer (United Kingdom) July 30, 2006. (source: Double-Tongued Dictionary)
Further reading
After our conversation about restaurant codes used to ensure efficient service, a chef in Charlotte, North Carolina, shares more examples from his experience in an upscale establishment. This is part of a complete episode.
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Outside of cooking, this condition is often known as “swamp ass.”