Board Thread:Questions and Answers/@comment-30863642-20161227074609/@comment-27701762-20161227134027

The use of the letter "A" multiple times in a row to denote surprise, screaming, and so on is a common factor in the English language. That it is used in the comic as a scream, and a potential name in Undertale which triggers a response from the game (which calls you out for not being creative) is a coincidence rather than a reference.