腹はら時計どけい

noun

internal clock; body clock; stomach clock

Colloquial term for the body's sense of meal times, especially hunger pangs that signal it's time to eat. Often used humorously.

• 腹はら時計どけいが鳴なって、もう昼ひる飯めしの時じ間かんだと気きづいた。

  My stomach clock went off, and I realized it was already lunchtime.

• 彼かれは腹はら時計どけいだけが頼たよりの生せい活かつをしている。

  He lives relying only on his internal clock for meals.