What is Buck Knuckle?
1.
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.."
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2.
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.
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3.
male
similar to the knee of a buck (male deer)
check out the buck knuckle on that dude!