Dattebayo and Believe It

In the original Japanese release of Naruto, is Naruto Uzumaki's catch phrase. He uses it at the end of most of his sentences as a way of making his speech unique.

Datte ba yo has no literal English translation, however, "Believe It!" was used in the English dub whenever Naruto is making a big statement to keep a similar tone in the English version of the series. It is also used to match the lip movements from the original Japanese release. Around the start of the Chūnin Exam arc, however, "Believe it" fell out of use. It also is translated as "Do you get what I'm saying?".

In the Spanish dub, it was translated as "Vaya que sí", which can be translated as "well, it comes to yes".

In the Latin American Spanish dub it is also translated to "¡Créelo!" or "¡De veras!", roughly meaning "For real!".

In the Swedish manga, Naruto often says "Typ" and "Liksom" which doesn't really have an English translation but it's a little like "like, totally, you know!".

In the Filipino dub, various words are used in place of "Datte ba yo!" all for the purpose of emphasis.

In the Brazilian dub, Naruto says "Tô certo?!", meaning "am I right?", and "Tô certo!", meaning "I'm sure".