Dark World
A state of mind one achieves usually when one smokes a marijuana, tobacco joint. Its usually a feeling of sickness with horrible thoughts running through your mind. Combated by closing ones eyes. 

Can sometimes be an enjoyable experience. For example, if one has played world of warcraft, you will know waht happens when you die. That is darkworld.

Other ways of going to darkworld are

a)smoking a ciggarette (if a non tobbacco smoker) 
b) mixing drugs, especially alcohol

or various other ways

Man i just smoked one hell spliff, it sent me to Dark World