It plays into the twin name similarity that Alex said exists between Mabel and Dipper: MABel MABus
The name “Mabus” is also surrounded by this big conspiracy. Nostradamus, a supposed prophet from the 16th century, predicted that it would belong to the third anti-christ, and some people take that seriously because Nostradamus predicted other past ‘anti-christs’ like Napoleon and Hitler. (There’s no conclusive evidence to prove that Mabus is the name of the next anti-christ however)
We know that Alex is a conspiracy theory nut. We also know that he likes to jokingly refer to himself as Satan, and enjoys dark humor (he was gonna include ‘Penta-grahams’ as a child snack for Heck’s sake). Dipper’s real name being connected to the next possible anti-christ sounds right up Hirsch’s humor alley.
It’d also explain why Dipper has to use a nickname. Could you imagine a character regularly being called “Mabus” on Disney TV? lmao
“I lied to everyone else but you. I told you I don’t do relationships.” “No, you don’t do relationships with guys. I do. You know how I know? Because I want one. With you. After the game all I wanted to do was kiss you. And what would you have done? You would have freaked.”
To our awkward and adorable goddess-like visual, Son Naeun. Please continue to grace us with your endless perfection and I hope this year brings you many wonderful opportunities. We love you and happy birthday, baby girl. ♡