peko-peko
Describes a gnawing hunger where your stomach feels completely empty. One of the most common body onomatopoeia in daily Japanese life.
💡Coming home after school — 'I'm peko-peko, what's for dinner?'
お昼を食べ損ねてお腹がぺこぺこだ。
I missed lunch and my stomach is peko-peko.
I haven't eaten since breakfast — I'm absolutely ___!
朝から何も食べていなくて、お腹が○○だ。