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1.
A term used to describe an elected official (male) of the United States Congress, specifically the lower house of Congress (known as the House of Representatives).
After an arduous campaign, John became a congressman.
by Nicolai August 11, 2004
 
2.
Slang for penis. Due to the actions of Congressman Weiner in June of 2011, this word's meaning has changed forever.
Suck my Congressman.
by harborcreek June 17, 2011