偶ぐう成せい

noun, noun which may take the genitive case particle 'no'

impromptu; spontaneous creation

Literary term for something created on the spur of the moment, especially a poem or piece of writing. Often used in titles or descriptions of artistic works.

• この詩しは散さん歩ぽ中ちゅうに偶ぐう成せいしたものです。

  This poem was composed impromptu during a walk.