The line from Frank Zappa about the Telefunken U-47 was in a song called "Crew Slut". As part of a dialogue in the song, Mary (the so-called Crew Slut) asks, "What are you gonna give me?" Larry replies, "It looks just like a Telefunken U-47. You'll love it..." This of course, is a not so veiled reference to his enormous, waist-level partner, and action on her part colloquially referred to under the brand name of a modern off-road vehicle.