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Short for, "What a Horny Nut"
"Did you talk to Mark last night? WAHN!"
by Travis Combs September 15, 2005
Wahn means Dark, refering to Darkness, or lack of light.
Wahn is often used as an adjective.

Darkwahn went to the JekJek'tar
Dark Dark went to the JekJek'tar

I love strolls at midnight, they are so Wahny

Adj: He wore a very Wahn Coat.
by Eiji December 20, 2006