In reply to Aaron Jorbin.

“Cheatin’ uh?” message is unfunny, unhelpful, and unprofessional.

That's why it was supplemented with a more helpful error message 3 years ago, it just didn't get a highlight back then.

the message is emitted when user tries to access resource he has no permission to access

That's one of the scenarios, but not the only one. It can be seen in other situations, from expired nonces to a plugin or theme doing something wrong. I received some emails over the years from users who thought it was either an inappropriate translation or a core bug.