The Jargon File (version 4.4.7, 29 Dec 2003):

beige toaster
 n.

    [obs.] An original Macintosh in the boxy beige case. See toaster; compare
    Macintrash, maggotbox.


The Free On-line Dictionary of Computing (30 December 2018):

Macintosh
Apple Macintosh
beige toaster

    One of the trademark/brand names that Apple Inc
   use for their Mac family of personal computers.

   (2009-05-05)