Meta-Chap Not able to find any definitive information as to the origin of the phrase "that really chaps my ass." You can NOT convince me that any self-respecting cowboy
ever said this. Ever. Chaps notwithstanding. My husband says he first heard it in the military.
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Believe me, a websearch on this topic is NOT for the faint-hearted. Nor is it informative. At least, not in any productive sense.
And ....that really DOES chap my ass.