ガミガミ

adverb, adverb taking the 'to' particle

naggingly; gripingly; in a scolding manner

Describes the manner of complaining, scolding, or nagging persistently and loudly. Often used with 言う or similar verbs.

• 母ははは私わたしにガミガミ言いった。

  My mother nagged at me.

• 上じょう司しがガミガミと文もん句くを言いう。

  The boss complains gripingly.