Ideo- definition, a combining form representing idea, in compound words: ideology. See more.
On The Dark Side by John Cafferty & the Beaver Brown Band. This was written for Eddie and the Cruisers, a 1983 movie about a New Jersey bar band. In the film, the song becomes the band's big hit and leads to a second album and a conflict with their record company. Kenny Vance was the music supervisor on Eddie and the Cruisers.
This line is an obvious reference to the title of the album, and a reminder that the song title briefly bore that reference, too (it was originally called 'Lunacy'). As is explained in the book Speak to Me: The Legacy of Pink Floyd's The Dark Side of the Moon: