What is "oumpah-pah"

Oumpah-pah le Peau-Rouge (Ompa-pa the Redskin) is a comics series created by comics artist Albert Uderzo and comics author René Goscinny, best known as the creators of Asterix the Gaul. The series first appeared in the weekly Tintin magazine in 1958 though it remained serialised for a relatively short time. The stories were published in book form by Lombard and Dargaud starting in 1961. In 1995, the series was reissued by Albert Uderzo's own publishing house, Les Éditions Albert-René.