Lyric discussion by graviton 

Cover art for Mink Car lyrics by They Might Be Giants

ndo and Lombardi are on the right track I think. It's about the fear that too much success can kill an artists integrity. The "Mink Car" is money, success and fame. It's "driven by a guitar" because the singer's music career is what has brought all that success to him. But he's afraid that all of that success has killed his artistic integrity. He's afraid that his music has become a "hollow form".