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1.
The later period during the French Revolution where Robespierre and his disciplinary committee sent most of the remaining loyalists of the king to the guillotine, along with some middle-class folks who were considered suspicious.
Apparently also a term used by some clown to take cheap shots at the Bush administration. LOL BUSH SUX D00000D!
by Dassh July 31, 2004
 
2.
(n) The period of time during which George "Dubya" Bush was/is in the seat of power in the United States of America.
Child: "Mommy, when the hell will this awful reign of terror be over?"

Mother: "Hopefully by 2004, though if we are really unlucky, he might still be in office 'till 2008!"

*Child has heart attack*
by Konrad July 27, 2004
 
3.
when your friend is at your house taking a duce and you burst into the bathroom holding a water bottle-size object and yell REIGN OF TERROR!!! and then start beating him with said object.

alternate phrases that can be said when entering the bathroom are: "rent's due", "time's up" or "this is my house, bitch".
Jeff's been in the bathroom for like, twenty minutes now. I'm gonna unleash a Reign of Terror on him.
by Super Spoon Man October 26, 2011
 
4.
A historical period of suppression of suspected royalists and Girondists by the left thinking revolutionists of the day. Some estimates of up to 40,000 people killed are speculated.
Frenchman 1: We need to get rid of the counter-revs!
Frenchman 2: Lets grab that little girl and behead her I think we won't have to surrender to her because she's French too!
Frenchman 1: Oui. Let us proceed with our Reign of Terror.
by P. Kaltenbach January 11, 2008