ケツアゴ? nsfwか?
アゴの真ん中に縦に割れ目が入ってるのをお尻に例えた言葉です
https://share.yabu.me/82b30d30444170e6a8c819e8406e362a3695454a4617894ce2706f3840c6c003/59fc9a4cb50149ebe95a9588b159d6cdd7bc2c1d45433f5dc4161f063667daa2.webp
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Thank you... TIL 👍