Twiba's Calypso was an unreleased song, written by none other than the Ground Monsters one day because the Dig-Its had to go somewhere on vacay, and needed to release another song to indoctrinate even more victims into their cruel beliefs. Little did they know that the Ground Monsters' writing was so crappy, the song was never released to the public.
The lyrics to the song are just "Twiba's Calypso, Twiba's Calypso". Just like the theme song to the Ground Monsters, or Worms Rule, another crappy unreleased song, the lyric is repeated numerous times. Though nobody is really certain how many times the singular lyric is repeated in this specific case.