As a standalone soundboard clip, notarize works because the word itself already carries a sense of final, legal authority, even when the context is completely unserious. Creators tend to reach for it when they want a fast, recognisable way to say that something is settled, approved or beyond dispute, without adding a longer line of dialogue. Its brevity makes it easy to reuse across memes, reaction edits and comedy sketches, where a single emphatic word can land harder than an explanation and leave the joke to the visual that follows it.