Definition of piping hot in US English:

piping hot

adjective

  • (of food or water) very hot.

    as adjective ‘the crust was piping hot’
    as adverb ‘it is served warm, not piping hot’
    • ‘Each evening, when William came home from the pit, the tin bath would be ready for him filled with piping hot water.’
    • ‘These rested on a thick bed of piping hot apple sauce.’
    • ‘Coulombe treats the infected arm by placing it into a basin of piping hot water to drain the white-yellow pus.’
    • ‘Just then, their waiter brought out two piping hot dishes and placed them in front of them on the table.’
    • ‘I was intrigued by the lettuce soup, which turned out to be a piping hot concoction punctuated with fresh ginger and herbs.’
    • ‘I've been drinking mugs and mugs of piping hot tea and soup.’
    • ‘We enjoy cup, after cup, after cup of piping hot tea from this one preparation.’
    • ‘Next stop was Laragh where piping hot soup and sandwiches and tea awaited the fifty visitors.’
    • ‘After a frenzied game of backgammon in candlelight, I ran a piping hot bath and sank into it.’
    • ‘When we returned after the funeral, piping hot tea and snacks greeted us.’
    heated, piping, sizzling, steaming, roasting, boiling, boiling hot, searing, scorching, scalding, red-hot
    View synonyms

Origin

Piping, because of the whistling sound made by very hot liquid or food.