Due to their extreme overuse on Zebraspace's Discord server, tildes (~) have become a meme. Tildes are often used to denote a singsong tone, or an extended vowel sound (i.e, "Serrie-dear~" is pronounced like "Serrie-deaaaar"). In some cases, it is used to express pleasure, or to indicate a light humming that expresses contentedness.
goshdarntildesno"Calle~" is a mutation of the tildes meme, created through overusage of the free pizza tag and the promise of free pizza from Calleoca, who is known for her home-made pizzas.
I'm sorry about this one, Vortex.