Original: Their diet seems to be almost exclusively '' Tubby Custard '' mispronounced as Tubby Tustard by the characters ( which is created by a Tubby Custard machine and consumed by sucking through a spiral straw ) and '' Tubby Toast '' ( circular toast with a smiley face on it ) , and they are spectacularly messy eaters .
Simplified: Their diet is mainly of '' Tubby Tustard '' ( which is sucked through a circular straw ) and '' Tubby Toast '' .