Short form of a shuttle-cock, used to play badminton.
Phrases commonly heard during badminton practice include
1) Pay attention to the cock
2) Pass me the cock
3) Smash the cock
3) Did you get a cock?
4) Give the cock back
5) The cock was on your side
6) This cock is mine
7) This cock spins a lot
8) this cock is worn through, go get a new cock
9) Whack the cock as high as you can