1. Diminuitive form of Joe or Joseph.

2. Also, a baby kangaroo.

Australian slang:
3. A baby.
4. An effeminate man or fop.
5. A hewer of wood and drawer of water.
6. To taunt someone by calling them a 'joey'

British slang:
7. (19th century) A fourpence piece.
8. A fool or weakling. (London) From Joey Hunt, cockney rhyming slang for cunt.
9. A package smuggled in or out of a prison.
10. In coal mining, the person setting timber in a stall.