Я не знаю, говорят ли так дети на самом деле, но Мазда связывает этот слоган именно с детьми:

http://www.mazdausa.com/MusaWeb/displayPage.action?pageParameter=zoomMain

All children instinctively know it.
A few adults still remember it.
One unique car company refuses to outgrow it.
In grown-up language, it means the exhilaration
And liberation that come from experiencing sheer motion.
But as usual, children put it much better.
And simply call it Zoom-Zoom.
We practice it every day.

It's why we build the kind of cars we do.

Mazda. Always the soul of a sports car.

Общий смысл: вспомните ту радость от движения, которая была в детстве.