Crankshaft

[Sonia]

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 pistons] 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.

[PussyCat]

A shaft driven by a crank.

[Sarah]

When a women gives her man a [handjob] using [motor oil] as the [lubricant].

[Greta]

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.

[Raeanne Dimick]

YEAH [thats right] [CRANKSHAFT]!!
Someone whos being a real [duche].
Someone whos getiing really annoying.

[PussyCat]

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.

[Zipporah Schumaker]

a word formerly defining the sex move where you take a girl and put her on her head with her backside facing toward you. You proceed to screw her up the ass. At this point in time, you shove a funnel in the vagina and proceed to pour [a quart] of [motor oil] down it. After the motor oil can is empty, and your about to blow your load, you remove the funnel and spew in the vagina. Next you use your fingers like a [dipstick] and mix up the mixture in a cranking motion. Enjoy!

[Jessica]

a long metal rod, especially one in a car engine, that helps the engine turn the wheels: