oddly this "caca" felt more visceral to me that most "poop"'s or "shit"'s I've seen in a bit. summoned an image instantly. probably just surprise - good choice!

reminds me of a blackhat presentation of a web crawler

two young gentlemen introduced it as "caca", seemingly an acronym for sth, but they just couldn't help themselves and kept chuckling for next five minutes.

"Caca" means shit in a bunch of languages (at least as a term used with children, but not only, in Romanian, French, etc), that's probably the reason.