n. 1. The archetypal really stupid application for an embedded microprocessor controller; often used in comments that imply that a scheme is inappropriate technology (but see elevator controller).
"DWIM for an assembler? That'd be as silly as running UNIX on your toaster!"
2. A very, very dumb computer.
"You could run this program on any dumb toaster."
3. A Macintosh, esp. the Classic Mac. Some hold that this is implied by sense 2.
4. A peripheral device.
"I bought my box without toasters, but since then I've added two boards and a second disk drive."