This common meaning for outrage actually grows out of a vagary of folk etymology.
Slate(Dec 17, 2014)
Mr. Shapiro said he had little faith that any discovery would sway people from their favorite folk etymology.
New York Times(Jan 02, 2013)
At Queensferry, by a folk etymology, one of the lads wears a coat stuck over with burrs.
Lang, Andrew, Modern Mythology(2010)