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1.
A three week period in which the planet Mercury to appears to be in backwards motion.

during this time human beings experience many adverse effects, such as memory loss, loss of time, loss of items, loss of virginity, loss of common sense. As for technology many unexpected glitches occur during this time, such as software crashes and emails getting lost

2000 November - Bush-Gore election
2006 July - Zidane head butts Materatzi in World Cup final
2006 July - Israel / Hezbollah brew ha ha
2006 July - Software companies experiences unforseen glitches
I can't believe Zidane headbutted that I-talian guy in such an important game, must be mercury retrograde

smart guy: Hey guys its August, we all made it through Mercury Retrograde without any glitches

co-workers: uhhh its July still.

smart guy: God damn it, MERCURY RETROGRADE
by justapaperbag July 25, 2006
 
2.
A scapegoat for astrologists to use when shit happens.
Everything in my life is going wrong! It must be Mercury Retrograde.
by Antigone_ May 28, 2010