Top definition
An important part of an Internal Combustion Engine. It serves the biggest role of an engine, converting Linear motion to Rotary motion. It takes the piston's up-and-down motion, pushing the connecting rod therefore turning the crankshaft. It contains counter-weights to balance the crankshaft so to reduce noise and vibration. It is also connected to the camshaft for timing purposes via a timing belt.

The crankshaft must turn without friction, therefore it has bearings on the case and bearings around the connecting rod. Oil must be supplied, in fact the crankshaft sits in the oil pan. There must be little play, but lateral play occurs, see Crankwalk.

On Manual Transmissions, the wheel with teeth at the end of the crankshaft is called the Flywheel. On Automatic Transmissions, it is called a Flex Plate.
My crankshaft is experiencing crankwalk!
by Dave PreZzO February 05, 2007
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2
When a women gives her man a handjob using motor oil as the lubricant.
She crankshafted me at Jiffy Lube and now my dick is stained dark brown.
by Alex Winston June 14, 2008
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Yet ANOTHER term for a penis...
Person 1: Hey, what are you up to?
Person 2: Just jerkin my crank shaft.
Person 1: DUDE...WTF...
by DXF May 29, 2009
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The answer that one gives when asked a question that one either does not know or simply does not want to give an answer to. This response hails from the 'Churchill' car insurance advert in which their mascot dog (Named Churchill) is being asked questions. He gives the answer "CRANKSHAFT" before the lady asking the question has finished speaking.
Example 1:
A: "Do any of you know where my keys are?"
B: "CRANKSHAFT"

Example 2:
A: "What should I do in the event of a fire?"
B: "CRANKSHAFT"
by Doodlebugz February 05, 2008
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5
YEAH that's right CRANKSHAFT!!
Someone who's being a real duche.
Someone who's getiing really annoying.
"You're being a real CRANKSHAFT man!"
"Oh man, here comes CRANKSHAFT."or..
"Hey man,let's ditch CRANKSHAFT over there."
by see ya! May 22, 2003
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6
When one guy gets and erection, and a girl sits on his dick, does a split, and a third guy spins her around using her legs.
"I heard Kate got really dizzy doing the crank shaft the other night."
by Iamout August 16, 2016
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The vengeful act of crapping on a lover's chest while they sleep.

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7
A heterosexual "sex move/position" similar to 69 except where the male, on the bottom, normally would eat out the pussy of the female, he instead inserts an eggbeater(wire wisk) into the pussy and proceeds to crank it to the delight of his partner.
Alan tried this great new move on his gf. He called it the "crankshaft."
by give me thumbs up January 04, 2005
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The vengeful act of crapping on a lover's chest while they sleep.

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