Batrean Wedding Vows

Batrean Wedding Vows, p.n. refers to something completely ridiculous or apocryphal.
Ex: "That makes as much sense as Batrean wedding vows." [QeR]
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Addendum: From Stephan Sechi's Talislanta milieu; Batreans are a race in which the men and women are completely different from one another and, consequently, associate with each other as little as possible. [QeR]