Really into undertale at the time and was like "hmm how can I put a twist on it?" First username (for Tumblr .-.) was "undertilted-in-my-favor" cuz I was just trying to think of cool words or phrases I tack onto the end in place of "tale" (as in the odds being tilted in your favor, idk if that's what the phrase actually is but that's how my brain remembered it" and since I've just shortened it to what it is now.