Dobber

Noun

1. Alternative form of dauber (“marker pen used for bingo cards”).
2. 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.
3. One who dobs (someone) (informs against them or implicates them to authority).

   "Nikki is such a dobber, she told the teacher that I hit Karen in the playground."

4. 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.
5. A large marble.