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A K-head is someone who snorts Ketamine like it's going out of style and doesn't care if their nose falls off. They're so addicted they'd sell their grandma for a hit of K.
My K-head roommate snorted a whole bottle of Ketamine and then cried about it later.
This K-head tried to eat a line of K and it came back out in a sneeze.
At the K-head convention, they all just lay there and screamed into the void.