It's just his catch phrase! Like in the American version, "Believe It" Every super hero needs one.
Erm...That's only half true. "Dattebayo" is actually a verbal tic that Naruto says when he is excited or nervous. It was probably passed down from his mother, Uzumaki Kushina, as she often said "dattebane (ttebane, for short)"
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dattebane or dattebayo means,'ya know'. Uzumaki Kushina (naruto's mother) and Uzumaki Naruto use this word when they get exited
Because in the original Japanese version naruto said something else (I can't remember what) and they removed what he said in the dub and replaced it with Believe It! as it lip synced well with what he originally said. yeah like the guy above me said. in the Japanese version he said dattebayo and his mom would say dattebane. dattebayo means you know. like 'im gonna be hokage you know.' or something like that. and dattebane is like the (i guess you'd say) slang way to say you know. dattebane means ya knows. and naruto does say ya knows sometimes.
killer bee ya mean rapping(<----...?kikml2) Naruto tends to call sasuke "Teme". It's an extremely rude way to say "you". Naruto never calls sasuke "bataboyo", BUT Naruto does use "Dattebayo" at the end of most of his sentences. Dattebayo has no official meaning and is used by naruto as an emphasis at the end of his sentences. You could say that it's his exclamation point, seeing as he's a very expressive person. Also, just in case you wanted to know, Sasuke does call naruto a variety of names, but the most common ones he uses are "Usuratonkachi", "Baka", and "Dobe". "Usuratonkachi" literally means "thin hammer", so he's pretty much saying that naruto is useless. "Baka" means stupid, and is used very commonly in japan. Being called stupid in japan is a very serious thing to them. Finally "Dobe" is literally translated to "Dead-Last", but can also mean "loser" or "idiot". So, hope that helped you out, if it didn't, I'm very, very sorry.
hey if u gotta watch all the naruto episodes u can go watch it in naruto-tv.com!! itz the best site eva!!!... but some of the episodes are subbed and some are dubbed in english. you can even read the mangas! every new episode of shippuden and the new manga chapter releases on friday. check this site out it rox my sox!!! BELIVE IT!!! DATTEBAYO!!!
Naruto comes from the Uzumaki clan which aren't known to have Dojutsu so it would be safe to say Naruto has no Dojutsu.