@coded_artist @dj It's actually not.  亀 is the kanji for turtle, read as Kame in this context. ハメ (hame) can mean to break or to destroy something, or can be slang for "having sex."  波 is the kanji for "wave," read as "ha" in this context.
Thus, Kamehameha translates to either "Turtle Destruction Wave" or "Turtle Fucking Wave."
The similarity to some hawaiian is just a coincidence.