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1.
This is something said by people who have nothing to say. You can also say this to brake the silence. Just do not say it randomly while having sex, or it might get awkward.
example 1
guy 1:You want to rob a bank joe?
guy 2:uh, the world is green!
guy 1:what?

example 2

girl: oh baby
guy:the world is green
girl:we are through
by monster man321 February 23, 2011