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Knucklebuster

A car, usually an old American car (1930's-1970's) who seems determined to skin, slice, and slash the hands of every mechanic who touches it, regardless of their skill-level. Resistant to tools, penetrating oils, vice grips, and laws of physics. Any bolt that is in this car will STAY in this car, whether you want it there or not, and if you try to remove it, it WILL break off, and leave you requiring 15 stitches in the process.
Holy Hell.........that '49 Mercury just tore my whole hand open, and all I was trying to do was change her damn oil!! What a knucklebuster!!

knucklebumped a floater 

when one's aggressive ass-wiping causes him or her to forcefully strike the chocolaty log within the toilet bowl.
i was taking a behemoth dump on my break before i looked at my phone and saw that i had only one minute 'til punch in time. i was wiping so aggressively/quickly that i, accidentally, knucklebumped a floater.

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

Knucklebuster

One who likes to work on his own shit yo. One who likes to have split knuckles with blood and greese all over his/her hands. Like to say take a muffler off yo with a hammer and chisel and a cut off saw at 3:00 in the morning while the neighbors sleep. Knucklebusta yo
Like when your taking off a rusty U-clamp bolt from a muffler with a ratchet and you apply full force and the bolt snaps off forcing your hand full force into a jagged rusty piece of metal on the frame or some shit.

knucklebutt

A girl who is so skinny, most likely from anorexia, that when she wears a bikini you can see the bones of her pelvis move around in her ass when she walks because she has almost no butt cheeks.
"Danm! Someone tell that knucklebutt bitch to get some meat on her!"
knucklebutt by Joe July 27, 2003