The story
From spin + dizzy. The science fiction sense was coined by American author James Blish in 1950 for the Cities in Flight series of books (published 1950–1962).
Etymology from Wiktionary, CC BY-SA 4.0.
spindizzy
Today it means: An engine-powered miniature racing car running on a circular track, tethered by cables to a central pole, popular in the 1940s. Full definition →