A large marble.
A dabchick.
A member of the working class in Scotland or Ireland who is seen as undereducated, with poor taste, especially in clothes, and poor social skills; closely connected to chav.
Any small electronic device that plugs directly into a larger one, such as a wireless scoring system in fencing or a USB mass storage device.
One who dobs (informs against or implicates to authority).
A float (as used by an angler).
A person who regularly uses heroin.