This is the 7022nd most frequent Japanese word.
メンゴメンゴ
"メンゴメンゴ" is a casual and playful way to say "sorry" or "oops" in Japanese.
Here, 'メンゴメンゴ' is used as a casual apology intending to quickly express one's regret.
メンゴメンゴ、忘れ物を取りに帰ります。
Sorry, I'll go back to get what I forgot.
In this sentence, 'メンゴメンゴ' conveys a light-hearted apology, asking others to resume their activity interrupted briefly.
メンゴメンゴ、ちょっと気にせずに続けてください。
Sorry, just proceed without minding me.
This use of 'メンゴメンゴ' apologizes for lateness in an informal, friendly manner.