Naruto Uzumaki's distinctive "dattebayo" (だってばよ) catchphrase comes in many forms. The early anime dub by Viz Media translated it as "Believe it!" Later, it was changed to a simple "Ya know." The manga didn't use either of these terms until Naruto met Killer Bee. Until then, it was omitted entirely. The problem was that there's no direct English equivalent to dattebayo, so nobody knew how to best convey the catchphrase to English-speaking audiences.
Source：https://www.cbr.com/dattebayo-anime-meaning-explained/
