A pervasive myth says the Japanese language lacks swear words. But beyond mere rudeness lies a level of words called kotobagari: words too taboo for publication or broadcast, most of them tied to the marginalized of Japanese society.
Kotobagari: The Banned Words of the Japanese Language - Unseen JapanIt's often said that there are no swear words in Japanese. But while profanities may be rare, taboos - and banned words - abound.unseen-japan.com