“In Aztec mythology, Xolotl was the god with associations to both lightning and death. This deity and a dog were believed to lead the soul on its journey to the underworld. He was also god of twins, monsters, misfortune, sickness and deformities.”
“X O L O T L, MY TIME HAS COME TO BURN
I INVOKE THE ANCIENT POWER THAT I MAY RETURN”
So it turns out Bill actually says “A X O L O T L,” which is a Mexican salamander that Alex Hirsch has referenced before both inside and outside the show. Still, the connection here is pretty interesting, even if it’s most likely coincidental!