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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?

knuckle nut 

"Quit being a knuckle nut and come help us". Or, "I had a knuckle nut in the shower this morning".
knuckle nut by TheParrott May 19, 2010

Knucklebutting

The act of inserting multiple fingers at least second knuckle deep into your partners rectum, optimally by surprise. Often done during fellatio or cunnilingus.
Sabrina is great at knucklebutting, she can get third knuckle deep before you even notice.
Knucklebutting by SasquatchSB October 5, 2010

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."

Knuckle Bumping the Oatmeal 

When you fist a loose bitch with a yeast infection.
Wallace- Dude, you took her home last night? She's a no-go with that YI.
Jones- Nah man. I was knuckle bumping the oatmeal all night.
Wallace- You're fucking sick.

knuckle wanker 

The act of pleasuring yourself by repeatedly punching yourself in the cock.