As an expert in cultural studies and language, I can provide you with an accurate definition of the term "seppuku" as it is understood in various contexts, including the Urban Dictionary, which is an online dictionary that offers slang definitions written by its users.

English Answer:
Seppuku, also known as "harakiri," is a traditional Japanese form of ritual suicide by disembowelment. Historically, it was a method used by samurai to avoid the shame of defeat or capture, as well as to preserve their honor. In modern times, the term has been adopted in various contexts and can be used metaphorically to describe a situation where someone is forced to take responsibility for their actions, often to the point of self-sacrifice. The Urban Dictionary may also include more contemporary or slang definitions that reflect the evolving use of the term in popular culture.

中文回答：
"Seppuku"，也被称为“切腹”，是日本传统的一种仪式性自杀方式，通过剖腹来实现。历史上，这是武士用来避免被俘或失败的耻辱，以此维护他们的荣誉。在现代，这个术语被采用在各种情境中，并且可以被用来比喻地描述某人被迫为自己的行为承担责任，通常到了自我牺牲的地步。Urban Dictionary 也可能包含更多当代或俚语定义，反映了这个术语在流行文化中的演变使用。

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seppuku (hara-kiri) is the mode of suicide adopted amongst Samurai when they have no alternative but to die. Tales of Old Japan. Algernon Bertram Freeman-Mitford. Hara-kiri, or seppuku, is the term applied to suicide among the samurai class.read more >>