a phrase used jocularly or humorously to denote never. The illustration below will elucidate it.
I will pay you the debt when the world ends (meaning I will never pay you the debt).
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man A: When will the world end?
Man b: 9/15/12
man a: thats messed up
man b: Y?
man a: thats my friends birthday
man b : that sucks
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