I recently discovered the 'Cheatin' uh?' error message. I then searched my WordPress files for 'wp_die' which precedes these messages.
Another discovery "Slow down cowboy, no need to check for new mails so often!"
There is obviously an attempt a humor here. But, as more and more businesses want to use WordPress for their sites, I would suggest these kinds of lines be changed to something less 'cute'. I have to go thru and change them manually. And, when I upgrade, I assume they will all be back.
I find 'Cheatin' uh?' to be snarky, and not at all helpful to the user.
I did a search and so far have found that text in:
WordPress, and the team of people who work on it are amazing. I am so grateful that we have this fantastic platform. It allows us who use it to be creative and build great websites. And, I suggest we keep the humor (or not) on the front end!
I hope this can be changed in upcoming versions.