Shorthand for Wudang-Quan, which is a very old chinese martial arts, which incorporates self discipline and other spirtitual practises. Is from Hubei, China.
Friend 1: You must learn to be a Wudan Warrior.
Friend 2: Teach me how
Friend 1: Learn some self discipline first.
Wudan is basically a short way to say Wudang-Quan which is some type of Chinese martial arts from several centuries in the historical context of Asia. It is part of China's martial arts culture.
Friend 1: My teacher said he used to do Wudan when he was a teenager
Friend 2: nice, Wudan sounds really cool