gadge - A gadget, but also a name you give someone when you don’t kn

A gadget, but also a name you give someone when you don’t know who they are.

That bloke at the bar, I called him a gadge, didn’t know his name.

That guy in the queue, I called him a gadge, couldn’t be bothered to ask.

That total stranger, I called him a gadge, and he was annoyed.