The Song:

In order for it to feel more authentic, Beck filled out his Song Reader book with fragments of songs and melodies, as well as fictional album collections and song titles. "I Traded In The Thunderbird For A Minivan Like Tim's" can be found on the album of manly hymns, Hymns For Him.

While some of the titles listed on Hymns are references to older sheet music/songs, some are just joke phrases, like this one.