cup holder
n.
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.