Baka bomb means: The Yokosuka MXY-7 Ohka, a rocket-powered, human-guided kamikaze attack aircraft employed by Japan against Allied ships towards the end of the Pacific War.. The word is mostly archaic or historical; you will only encounter it in old texts, period drama, or school history rather than current teen conversation. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour.