Substance that results from the mixing of semen and vaginal fluids that rolls down the nut sack and grundle after unprotected sex. Once mixed, if left unattended, a sticky residue will result on the nut sack and grundle with a profound citrus like smell.
Fuck man, wash up after gettin some I can smell your duck butter from over here.
by MikeAllen September 01, 2004

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sweaty film produced on a man's balls and taint after much physical activity on a hot day.
"get out the gold bond, Ed, after walking clear across campus the ol' duck butter is getting thick!"
by total playa June 01, 2004

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the name of a product, used in the lubrication and assembly of hub and spigot pipe. applied to the inside of a gasket that has been placed inside of a hub end and on the outside of the spigot end prior to joining to ease the process along. duck butter itself is comprised of water soluble vegetable shortening.
pass the duck butter and grab the pry bar, we're getting this done today.
by Alpha Raptor July 21, 2008

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Nothing in relation to the sweat glands on ones crotch or anus-y areas. Instead, Duck Butter is the secretion on Ducks wings and feathers so that they may still fly even after being in water.
Child: Mommee, why canz teh duckkee stiww fliiiy????
Mother: Because of teh duck butter, child.
by Brocke June 25, 2005

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The sweat that forms beneath a man's testicles and between the cheeks of his butt.
Dave: So man, how'd your date with Cindy go last night?
Steve: Oh bro... it was great! I gave her some of my Duck Butter.
Dave: ...You're one sick fuck, Steve...
by Diatome May 11, 2009

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A cheesey (and profoundly smelly) secretion that collects on the backside of an unwashed scrotum
John was surprised to find that he liked the taste of DUCK BUTTER on his morning toast.
by JTB October 06, 2003

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A broad term to describe any sort of deposit, build-up, slime, grime or sludge with a likeness to feces or slugs, the consistency of a glob of grease or jello, and colors from light beige, neon orange, to black.
"I went to open my car door and there was someone left some duck butter on the handle."

"When I walked into the bathroom, it smelled like Hoboken and there was duck butter splattered on the mirrors and on the ceiling."
by baconn August 29, 2012

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