The male version of the camel toe. When a man wears pants that are so small and wears them so high that his balls are visable through the pants. When pants are warn like this, his balls straddle the middle pants seam (just below the fly) thus dividing them causing the appearance of a buck knuckle. Similar to a camle toe.
Dude, since you gained weight you might want to consider getting some bigger pants. You're startin to sport some serious buck knuckle.
by macenin April 04, 2009
When a guy tucks his balls up in the front rather than the back producing a camel-toe... or a moose knuckle otherwise referred to as a "buck" knuckle being that a BUCK is a male.
"Holy shat... he tucks his balls up in the front... looks like a camel-toe" ..."No dude, that is a buck-knuckle.."
by Van March 04, 2005
The male variation of the female cameltoe. A more pronounced and undesirable male cameltoe.
What is that guy thinking, bicycle shorts? Hes sportin wicked buckknuckle.
by Eric 452 September 19, 2006
Male version of the Camel Toe. When a mans pants are so tight it seperates his testicles individually from an outside view looks like a pair of Buck Knuckles. Also known as Moose Knuckles. Robert Plant is famous for his buck knuckles.
Either that Emo kid has a vagina, or hes flashing his buck knuckles.
by Justin W November 10, 2007
male camel toe

similar to the knee of a buck (male deer)
check out the buck knuckle on that dude!
by dirk diggler June 27, 2004

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