Hehh-duHpp is a Klingon exercise used to teach infants hand-eye coordination so they can grow up to become warriors. It involves shaking a rattle in front of them to teach them rhythm.
While taking care of young Yoshi, Worf tried to teach him some hehh-duHpp. (DS9: "Time's Orphan")
Lyrics:
- wa-TacH,
- doo-Ga-ya,
- gung-gung-gung.