The tray of a CD-ROM drive, or by extension the CD drive itself. So
called because of a common tech support legend about the idiot who called
to complain that the cup holder on his computer broke. A joke program was
once distributed around the net called cupholder.exe
, which
when run simply extended the CD drive tray. The humor of this was of course
lost on people whose drive had a slot or a caddy instead.