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1.
slang for ketamine, an anesthetic used as a recreational drug
He was in a stupor from vitamin k.
by The Return of Light Joker August 30, 2010
 
2.
Keystone, Getting your daily dose of Vitamin K.
"Man my body isn't agreeing with me today"
"Must have had a little too much Vitamin K last night"

"I have been have had such a tough week..."
"Sounds like you are having a Vitamin K deficiency."
by www.keystone.com September 08, 2009