An act where at the peak of an orgasm, the initiator of the orgasm, uses the 2nd knuckle of the middle finger( of the hand of thier choice) to rub the taint of the other person (or sometimes thier own taint) in a counter-clockwise circle, thus increasing the pleasure sensation immeasurably !
I would have gotten rid of her years ago but... she is the best Taint Knuckler I know. I would have gone out with Maggie Q but with such small hands her Taint Knuckling would leave me wanting so much more!
by The Dirty Geek February 16, 2011
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after your man ejaculates you punch him right in the balls since the sex wasn't fun for you but it was for him so you killed his vibe.
josh was so rough on me and he went fast and did not stimulate me i could not get him off me so when he finished i punched his balls so he does not get away with taking advantage of me during sex. angry knuckler
by virginiavirgin July 12, 2016
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An alcoholic beverage, typically served in a chilled shotglass. Contains equal parts premium vodka and rootbeer Schnapp's
Tuesday Nights: Ice Chilled Brown Knucklers $8
by Greg Fagnan July 11, 2008
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Someone who gets into fights for the fun of it. The term refers to reckless boxers getting bloody knuckles from not wearing hand-wraps
Brian: did you hear about Ted Cruz's filibuster?
Adam: yeah, he must really enjoy wasting tax-dollars.
Brian: we need fewer bloody knucklers like him in Congress.
by Btwice November 8, 2013
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a promiscuous lesbian; she would stick her finger in any dyke
Bob is wasting his time buying drinks for that dutch knuckler
by nippli February 22, 2017
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A poo knuckler is someone that shoves there fist up another persons ass.
Guy 1: You poo knuckler
Guy 2: Do you even know what that means?
Guy 1: no, what?
Guy 2: a poo knuckler is when someone shoves a fist up your butt!
Guy 1: No way, you just pulled that definition out of your ass
Guy 2: Literly!
by Walruses unite February 1, 2011
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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."
by Panface420 August 7, 2015
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