Botch

To “botch” something means to do it badly because you were careless or don’t have the skill to do it properly. There was speculation that Kim Jong-un was in a “vegetative state” after a “botched” open-heart surgery. In other words, there was speculation that Kim Jong-un’s alleged open-heart surgery went badly. A student might “botch” a presentation, or do badly on it, because he didn’t prepare properly.