ごめんちゃいalso: ごめんなちゃいMeanings1expressionsorry; my badcolloquialColloquial, playful, or childish variant of ごめんなさい. Often used in casual speech or to sound cute.See also: ごめんなさいあ、ごめんちゃい!忘わすれてた。Oh, sorry! I forgot.ごめんちゃい、ちょっと遅おくれちゃった。So sorry, I'm a bit late.