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.

Butt-knuckle by Bradley Brandt November 3, 2005

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Popping your butt knuckle

Farting or getting raped in the ass by a large shemale.

Dude that one website you sent me to last night was digusting, I didn't know shemales could be Popping your butt knuckle.

Popping your butt knuckle by UF Omega September 13, 2011

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knuckle butt

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.

knuckle butt by akellz September 19, 2012

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Knuckle butt

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.

Knuckle butt by Ballard757 February 19, 2011

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