Betelgeuseball is a red supergiant star in the Orion constellation
(on his shoulder). He is very old, near the end of his life. His light takes 500 years to reach Earthball, so as far as we know he could have exploded in a supernova by now. It is said that when he does blow up, he will be brighter than Moonball in the sky.
Saying his name three times makes him appear. If he blew up, Earthball could be annihilated by the gamma ray bursts emitted by the explosion, which are the second biggest explosion in the universe after the Big Bang, and turned into a wasteland only populated by insects. It's said explosions of other stars have killed off alien civilizations in the past and will kill Earthball's in the future. A star like him has already done the deed 450 million years ago, killing off 2/3 of all life.