Bum Knuckle

the steak Geoff had the night before created such difficulty pushing the poo out that it created a real bum knuckle.
by Dragon Iron January 05, 2014
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knuckle wanker

The act of pleasuring yourself by repeatedly punching yourself in the cock.
You're a knuckle wanker.
by Arnold Shwartzenigger October 09, 2019
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glazed knuckle

When you jizz on your knuckles after mast bating
After he master bated, Mikey took his glazed knuckle and donkey punched his roommate Evan.
by JayPare July 03, 2017
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knuckle bus

The van which Sears Holdings uses to rent out, if you do not have a big enough vehicle large enough to transport your purchase.
Hey Bill, could you take the knuckle bus to Advanaced Auto Parts to get some brake pads?
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Knuckle Blasting

Getting a tattoo of letters on each finger (generally excluding the thumbs) in order to spell a word or words about eight characters in length. The tattoo goes between two knuckles per finger on the outside of the hand.
"I had a little knuckle blasting session last weekend at the tattoo shop. It says 'hold fast' because I'm a sailor."
by Symmetria May 21, 2014
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