The nasty thick substance that forms on teeth of people who don't brush them.
Go brush your teeth, you've got a serious case of duck butter going on.
by Ibustedyou2 February 11, 2013

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The multicolored cheeselike smegma that collects inder the foreskin of uncircumcised men. in case you don't know this, you should be cleaning that so i don't have to in the doctors office!
Dr. says "Whats that under your foreskin, sir?" Its duck butter, Doc.
by uroligist's beeotch August 12, 2009

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The frothy mixture of lube and fecal matter that is sometimes the by-product of anal sex. Better known as santorum.
After I finished your mom last night, her duck butter stained the sheets.
by Bok May 09, 2006

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See smegma. This is a cross-reference.
Takeshia refused to give head to Tyrone because he had not pulled back is foreskin in a week.
by Richard Black February 27, 2005

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The buttery white liquid that is located south from the balls and in central america to the but hole. You can scoop it out in the shower.
I licked Mitch's duck butter last NIGHT.
by James Gilburetson March 22, 2004

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the pasty, sticky film that builds up between the leg and nutsack when engaged in strenuous activity
Scott worked out for two hours and wiped the handful of duck butter from his leg and slapped Bennett in the face with it.
by Shiggity shiggity shwa September 12, 2003

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The sweaty juice that builds up under the ballsack after strenuous activity.
After raking leaves all day, Doug had to wipe the duck butter from his crotch.
by web December 12, 2002

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