The exact original source of this short greeting is not documented in the available listing, so it is best understood through its online life as a reusable welcome clip. Short greeting sounds like this circulate on soundboards and in creator edits because they are instantly recognisable as a hello, easy to drop into an opening and friendly enough to suit many kinds of videos. That simplicity is why it keeps appearing whenever a creator wants to start with warmth rather than a joke or a dramatic sting.