wall wart
n. The blocky plug/transformer combinations used with modems, telephones, and other consumer electronics.

Example Citations:
One final note on connections: Except for the NEC AudioTower SpeakerSystem and the Advent Powered Partners AV570 speakers, the speakers we tested come with modular power supplies — known derisively in the electronics business as wall warts.
—Christopher Breen, “Blasting on a budget: speakers to jazz up your Mac,” MacUser, September 1, 1995

DED requires a wall wart (power supply) that supplies between 6-12volts of DC power with a minimum of 100 Ma capability in order to operate.
—Robert Thompson, “How to Evaluate CD Players — and How NOT to Enhance Their Performance,” Sensible Sound, November 1, 1998

Earliest Citation:
Furthermore, rather than having local power at the attendant desk (“a wall wart,“ as Mr. Williams so cleverly put it), the Centracom console is powered by a UPS System in the backroom. The power is fed to the console via the skinny wire.
—Ed Leibowitz, “Tone Commander‘s cute consoles for Centrex environments,” Teleconnect, February 1, 1990

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