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!
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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.