A Yakozen refers to a self-satisfactory taigazensha (one who practices zen but has an enormous ego), who uselessly proclaims they have earned shokaku (true enlightenment) even though there is no proof, also called "misho-isho."
なのに、徒（いたずら）に未証已証（みしょう・いしょう、いまだ証していないのに既に証覚を得た）という、独り善がりの大我禅者をいう。