The Collaborative International Dictionary
Piping \Pip"ing\ (p[imac]p"[i^]ng), a. [From Pipe, v.]
Playing on a musical pipe. ``Lowing herds and piping swains.''
--Swift.Peaceful; favorable to, or characterized by, the music of the pipe rather than of the drum and fife.
--Shak.Emitting a high, shrill sound.
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Simmering; boiling; sizzling; hissing; -- from the sound of boiling fluids.
Piping crow, Piping crow shrike, Piping roller (Zo["o]l.), any Australian bird of the genus Gymnorhina, esp. Gymnorhina tibicen, which is black and white, and the size of a small crow. Called also caruck.
Piping frog (Zo["o]l.), a small American tree frog ( Hyla Pickeringii) which utters a high, shrill note in early spring.
Piping hot, boiling hot; hissing hot; very hot. [Colloq.]
--Milton.
Wiktionary
a. (context idiomatic English) Very hot.
Usage examples of "piping hot".
The elves would set out a grand table, steaming stew and venison, sometimes roasted game fowl, and piping hot tea that warmed the boy from his head to his cold toes.
However, piping hot steam without loss of heat (and therefore pressure) proved to be extremely difficult and dangerous, especially in underground situations.
Above the gentle purr of the motors the loud buzzing of a Primus stove was borne to the Sub's ears, a grateful and comforting sound that gave promise of something piping hot within the next ten minutes.