The term piping hot means extremely hot. It is thought to have originated from the sound of the old pipe organs in large churches. It was first penned by Chaucer in the Canterbury Tales. He wrote Wafers piping hot out of the gleed.
A Competing Theory
In Scotland, when ceremonial dishes of food are brought to the table to the accompaniment of bagpipes, they are piped in; i.e., they are piping hot.
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