Belt of Never-Ending Agony

Belt of Never-Ending Agony is a leather waist armor. Prior to the Burning Crusade expansion it was one of the best waist items in the game for rogues and cat-form druids. Due to its high dps stats, Hunters and Warriors could also make positive use of this belt.

Source
This item drops from C'Thun, the final boss of the Temple of Ahn'Qiraj.