Kukoro-san, you misplaced important documents again!?
Ku koro = Shortened from "くっ、殺せ!", which translates roughly to "Urgh, (just) kill me!". A meme originating from fantasy themed eroges, where a proud female knight is captured by orcs or other monsters and is about to suffer a certain terrible fate.
Oh no, that's just an old meme. Don't take it seriously.
Even if it's a joke, you shouldn't say things like that!
