Quote:
Naruto's style is '(verb stem)tte bayo!' For instance, wakattebayo is "I get it already" or nan dattebayo is "What (the heck) is that?" It is another colloquialism not linked to any specific dialect that is meant to make the speaker sound rough and brusque, not very refined, and trying to sound tougher than they really are.
Kinda like Kenshin and his use of "de gozaru" which is a very polite way of saying "desu" (kinda like "it is" in English).
posted from japan reference