(computer hardware) Any small device that plugs into an electronic device, typically a computer, and alters its functionality. Common examples include wireless modems, digital media players, software copy protect devices, and adapters.

plural of dongle

A controversy of 2013 in which a woman at a technology conference took offense on overhearing an apparently ribald joke involving the word dongle and published the two men's photographs on the Internet in an attempt to shame them, causing one to be fired from his job.

(slang) Without a penis.