Actually, the line is:
"Badges? We ain't got no badges. We don't need no stinkin' badges."
Sigh. No, that's wrong also. Note: The phrase "we don't need no stinkin' badges" never appears in the film. It's a contraction of the actual lines, which are:
Badges? We ain't got no badges. We don't need no badges. I don't have to show you any stinking badges.