Klingon goat

From Memory Alpha, the free Star Trek reference.

A Klingon goat is a type of animal native to Qo'noS.

When Q had lost his powers and was arrested by Worf, he called the security officer a Klingon goat. (TNG: "Deja Q")

It is unknown, whether Klingon goats really exist on Qo'noS, or if Q was merely insulting Worf.