'diat cock' seerms to me a perfect example of translating a spoken phrase into print by someone who does not speak English natively.
'di-at' is a close approximation of what is heard, and 'cock' or even 'cok' is a common sound in languages where the long 'o', as in 'oh' sound in not common. I remember in basic German class in college that there were a few folks who seemed emotionally resistant to 'making those funny sounds'.

As to why people do NOT ask for help or consult a dictionary or spelling helper? Now we're into psychology. For years, Japanese manufacturers considered it something like a point of honor to 'learn' English and write their own instruction manuals. leading to all the jokes we remember. Now, big places like Sony have translations done by experts for the various languages, and their manuals are pretty clear.