A piece of computer hardware that is provided with software. This hardware has to be attached to the computer (example: Printer port) to allow the software to work.
The CAD program SOLIDEDGE won't work unless the dongle is installed.
"Dude, your boss just came into your office, changed the channel on your television, and ripped down the papers you had on the bulletin board. What a dongle!"
the thing that hangs from the ceiling in a tain that you hold to. Often on trains in the London Underground. Can also be used as a metaphor. Dongling someone is when you are constantly badgering them and trying to get their attention by pulling their arm.
"Stop dongling me"
"I held on to the dongle as the train started"