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To slip one's knuckle into the crack of an unsuspecting victim. Similar to a credit card but using the knuckle.
When Sally bent down to pick up her shoes, Bryan reach over and gave her the 'ole knuckle butt.
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A guy who is not gay but loves it when a girl penetrates his anus with her finger during sex.
Jeremy's motto is "your not gay if a girl is doing it to you. Guess you can say he's a knuckle butt.
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(noun) The popping sound made by an explosive fart. A crisp and short passage of gas from ones butt.
Excuse me while I crack my butt knuckle.
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1.)The smelly brown knuckle of the finger or thumb inserted in someones butt. 2.)The person inserting said finger or thumb 3.) The act of inserting said finger or thumb in one's butt, possibly due to boredom or lack of interest. 4.)Someone who complains alot but does nothing and/or offers no suggestions about how to remedy the problem he/she is complaining about.
Dave is such a butt-knuckle that rather than do something useful he'll just sit there with his thumb up his butt complaining about everything. Hey can you help me with this right after you go wash the stink off of your butt-knuckle. Don't go butt-knuckle on us now we may still need your help before it's all over.
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When a male wears his pants/shorts extra tight and his balls are showing. The opposite of Camel Toe.
Check out the Butt Knuckle on that guy!!!
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The consensual act of having aggressive anal sex with someone who has horrific hemorrhoids in order to break them down
Angie knew when she had got hemorrhoids again it was time for Peter to start bustin' butt knuckles to get some relief
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