kemosabi

Etymology
Coined for the 1938 Lone Ranger television serial, apparently from a corruption of Spanish quien lo sabe "(he) who knows".

Noun

 * 1)  An appellation given to a wise friend.

Usage notes
The use of this term is mildly offensive among English-speaking Latinos, who see use of the term on the original television serial as fawning on the part of Tonto (whose name means "stupid" in Spanish).