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1.
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
 
2.
Short for, "What a Horny Nut"
"Did you talk to Mark last night? WAHN!"
by Travis Combs September 15, 2005