guchi-guchi
Whining and complaining about the same thing over and over. The repetitive negativity wears on anyone who has to listen.
💡After a bad day at work — 'He's been guchi-guchi about his boss all evening.'
ぐちぐち言わないでよ。
Stop complaining guchi-guchi already.
She kept ___ about the restaurant service for the rest of the night.
彼女はレストランのサービスについて一晩中○○文句を言っていた。