Jadzia Dax: By the way, what does… “gung-gung-gung” mean?

Worf: Why do you ask?

Jadzia Dax: It was the strangest thing. When I was taking Yoshi home, he kept shaking his rattle and saying “gung-gung-gung.”

Worf: He did?

Jadzia Dax: He seemed to be getting a kick out of it. What does it mean?

Worf: That is between Yoshi and me.

Star Trek: Deep Space Nine, Season 6: Episode 24 – “Time’s Orphan”