I doubt 1 person in 50,000 knows the meaning of that expression. I’m almost 80 yrs old and ex military who served in Texas and I never heard it.
If you've ever seen the movie 'Green Mile' with Tom Hanks, Michael Clark Duncan and James Cromwell, that line is said in the movie. That said, I'm a 35 year old schmuck born in Brooklyn and I know what it means.