that "junk" in your car's trunk

So I was at the gym this morning, and the Argentine radio station played that "junk in your trunk" song. If you don't know it, it goes something like "what are you going to do with all that junk in your trunk?...that junk in your trunk? " and it is unfortunately referring to a woman's bottom.

I was just wondering, if an Argentine tried to translate that into Spanish to figure out what this dumb song was saying, and took it literally: "what am I going to do with all my loose articles and belongings in my car's trunk?" what would he/she think?

"why is this dumb song asking me that? I don't know, I'll put that stuff in my garage I guess..." which then a new song would have to be created "what you gonna do with all that junk in your garage, ya in your garage..."