Muttering or mumbling indistinctly; speaking in a low, unclear voice so that words are hard to understand.
彼は何かごにょごにょ言っているが、聞き取れない。
He's mumbling something, but I can't make out what he's saying.
先生に注意されて、生徒はごにょごにょ謝った。
When the teacher scolded them, the student muttered a half-hearted apology.
電話の向こうでごにょごにょと話す声が聞こえた。
I heard someone mumbling indistinctly on the other end of the phone.
会議中に横からごにょごにょ言う人がいて集中できなかった。
Someone kept whispering and mumbling from the side during the meeting, so I couldn't concentrate.