Top Definition
A women or girl who upon giving one a hand job, grabs and holds on for dear life. They grasp until their knuckles turn a faint tan or white color. In some extreme conditions, friction burns may result.
Wow, my penis is still recovering from that white knuckler!
de Whoopdaddy 13 Ianuarie 2012

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Photos & Videos
When a handjob is so constricting that the white's of the person performing the jobs knuckles are visible.
Yo meng, I went out to dinner with this body building chick, and when we got in the car she gave me the most hateful white-knuckler.
de ritmer 14 Noiembrie 2010

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When one has to shit so forcefully that it is required that one grips the top of the bathroom stall so tightly that your hands, and most notably your knuckles, turn white. Often accompanied by excessive groaning, tears,and, in truly tragic situations, blood. Happens when the body lacks water to a degree that your intestines are almost stopped up but can still be cleared with enough 'push'(not constipation, but just barely).
I assumed from all the grunting that the poor chap in the stall next to me is in for a white knuckler.

"Jesus Christ, you took a long time to shit" "Yeah, it was a white knuckler."

"That was my third white knuckler this week. I'm gonna have to start shotgunning prune juice before every meal or just start cutting cheese out of my diet."
de Panface420 10 Septembrie 2015

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