Front-Ranger, according to your profile, you are at least 9 years younger than me. I am 63 as most members know.
I have read figures of speech and certain expressions which were supposed to have been said 40 to 100 years ago in the Western USA (West of the Mississippi River) and they seemed to be modern expressions.
But, in doing academic style research in books at local libraries, I found those expression did exist at the time the modern writers said they did.
When I was in the US Army and in Basic Training at Ft. Polk, Louisiana, I heard the expression said by drill instructors, "I am going to kick your ass into next week." While they could say that to a trainee, they would get into trouble if they actually did it. While I never had a drill sergeant threaten to kick my ass, I had more than one threaten to kick me in the ribs because they thought that I was not doing enough pushups to make myself have a stronger grip to go on the horizontal ladder. My arms were actually strong enough to hold me up; the real problem of the grip was actually in my hands (but, the ignorant NCOs were too dense to know that).
In the 1950s and 1960s, I heard people say they "were thinking out loud." And some said when they were actually sitting down and thinking silently, "I was just sittin' here studyin'." That "studyin'" expression was in the very same category as Ennis's "I sure wrang it out a hundred times thinkin about you."