hanging a rat refers to the slow, methodical art of defecation and was a term first used in mid-16th Century Scotland by nobles and feudal lords.
Bruce and his friends ate a lot of Mexican food, and reported hanging rats all night because of it.
by Hanging Rats on Facebook April 15, 2014
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What kept you in the bathroom so long? I was hanging a rat.
by Anonymous March 13, 2003
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to show your flaccid dick.

also known as 'showing a rat', 'dangling a rat'.
i'm one beer away from hanging a rat;

a horrified Harvey looked up to see six inch rat hanging in the window.
by rick wrangler March 16, 2010
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That stumbling down the street while wrecked term when you've got to pee and no bathrooms in sight.
Hey guy's, how much further cause I got to hang the rat!
by Peter Vogel January 26, 2007
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Another slang term for peeing.
Man, I gotta go hang the rat..................
by batmite August 5, 2006
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To urinate. Usually after drinking large amounts of coffee or beer.
After drinking all that coffee I really gotta hang a rat!
by Daveco Inc October 22, 2005
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