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1.
the prohibition amendment; outlawing the use & sell of alcohol or any alcoholic beverage
The 18th Amendment was not very successful.
by amanda June 23, 2003
 
2.
The Amendment that you use when you are drunk--meaning to take the fifth.
Jim thought he would not incrimenate himself by claiming the eighteenth, but in the end he was just totally fucking drunk.
by piro May 18, 2003