Interesting. I know “kak” from Afrikaans and “cachu” from Welsh. I’ve never seen the word definitively derived from Greek; I always believed the root was from PIE language. What do I know?
Yeah - I assumed “shit (people)” was what we were going for; “k” doesn’t exist in Welsh so I asked for the alt spelling. Cacophony then translated as “shit sound” in my head - which again, kind of, works. Language is difficult.