Board Thread:Episode Discussions/@comment-1181222-20180726120028/@comment-24572728-20180801204512

To add the the previous post/reply, it's a Japanese colloquialism. Boruto if I remember correctly calls Naruto "oyaji" which comes from two kanjis meaning "parent" and "father". It's just that it can be rude to use the term to someone who is not your father because then it means old man. Kind of similar to the term "pop/pops", which you can use to call your own father, or to refer to an older male stranger, oyaji is just very informal and in a country like japan were the elder must be treated with high levels of respect, it can seen as rude.

Like how some people do not want to be answered with a "yeah" or "yup". My mother will make say "yes" to her if she ever asks for my confirmation.