Dattebayo and Believe It

In the Japanese series of naruto Dattebayo! is Naruto Uzumaki's catch phrase. He uses it at the end of most of his sentences as a way of making his speach unique. Dattebayo has no English translation, but the English naruto series use Believe It! whenever Naruto is making a big statement to keep a similar tone in the English version of the series.