Answers.com defines 'cock' as:

cock¹ (kŏk)

n.

1. 1. An adult male chicken; a rooster.
   2. An adult male of various other birds.
2. A weathervane shaped like a rooster; a weathercock.
3. A leader or chief.
4. A faucet or valve by which the flow of a liquid or gas can be regulated.
5. 1. The hammer of a firearm.
   2. The position of the hammer of a firearm when ready for firing.
6. A tilting or jaunty turn upward: the cock of a hat.
7. Vulgar Slang. The penis.
8. Archaic. The characteristic cry of a rooster early in the morning.

v., cocked, cock·ing, cocks. v.tr.

1. To set the hammer of (a firearm) in a position ready for firing.
2. To set (a device, such as a camera shutter) in a position ready for use.
3. To tilt or turn up or to one side, usually in a jaunty or alert manner: cocked an eyebrow in response to a silly question.
4. To raise in preparation to throw or hit: cocked the bat before swinging at the pitch.

v.intr.

1. To set the hammer of a firearm in a position ready for firing.
2. To turn or stick up.
3. To strut; swagger.

idioms:

cock a snoot (or snook) Slang.

1. To express scorn or derision by or as if by placing the thumb on the nose and wiggling the fingers; thumb one's nose: “[He] could cock a snoot at the rest of the . . . world and blithely go his own way” (Elie Kedourie).

cock of the walk

1. An overbearing or domineering person.

[Middle English cok, from Old English cocc, probably from Late Latin coccus, from coco, a cackling, of imitative origin.]

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