In the Japanese versions, Naruto often ends his sentences with "dattebayo" or "(verb)-ttebayo", and as such Naruto has a unique style of speech. In the Japanese language, an ending can be added with no meaning to make the tone sound more tough, childish, girlish, or many other changes depending on the many existing endings. "-ttebayo", which is not a well-known ending, has no literal meaning and cannot be translated, but carries the connotations of the speaker being uncultured, brusque, and seeming tougher than they really are.In the English anime and video games, he often says "Believe it!" to fit with the mouth flaps of "-ttebayo".
Despite what superking said, Jaivez was completely right. Dattebayo has NO actual meaning and is just tagged to the end of narutos sentences, its just like his dialect.
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?"
Directly derived from an actual interview with the creator himself, Masashi kishimoto.
(Quote)
- Is Naruto's favorite phrase, "dattebayo" modeled on anything?
K: That isn't really modeled on anything either. When I thought of childlike
speech, "dattebayo" instantly came to mind. It's like it's become a part of
Naruto, and even now it brings out his "mischievousness".
(End quote)
I guess it's just up to fans to determine for themselves what it truly means...