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Kabedon (壁ドン, lit. "wall bang"), or kabe-don, is the act of hitting a wall with the sound "don".
It is separated from two Japanese words, with kabe (壁) meaning "wall", and don (ドン) being the sound made when a strong force is applied to the wall. This term usually refers to romantic confessions between lovers.
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壁ドンとは (カベドンとは) [単語記事] - ニコニコ大百科 (NicoNico Encyclopedia)