- You may be looking for Metebelis III or Metebelis crystal.
"Kalacha nee-too webweb!" was Metebelin for "Gosh, it's bigger on the inside!" This was once uttered within the Doctor's TARDIS. (PROSE: The Secret in Vault 13 [+]Loading...["The Secret in Vault 13 (novel)"])
Metebelis III was a favourite planet of the Doctor's, (TV: Carnival of Monsters [+]Loading...["Carnival of Monsters (TV story)"] etc.) known for its Metebelis crystals. (TV: The Green Death [+]Loading...["The Green Death (TV story)"], Planet of the Spiders [+]Loading...["Planet of the Spiders (TV story)"] etc.) The Eight Legs lived here, with their human slaves. While the Third Doctor visited, their speech was translated (TV: Planet of the Spiders [+]Loading...["Planet of the Spiders (TV story)"]) by the TARDIS translation circuit. (TV: The Masque of Mandragora [+]Loading...["The Masque of Mandragora (TV story)"], The End of the World [+]Loading...["The End of the World (TV story)"], The Girl in the Fireplace [+]Loading...["The Girl in the Fireplace (TV story)"], etc.)
There also existed a Metebelis I, II and IV, (GAME: The Edge of Reality [+]Loading...["The Edge of Reality (video game)"]) though Metebelis IV was a barren, untouched paradise (AUDIO: The Vanity Trap [+]Loading...["The Vanity Trap (audio story)"]) with voice eating wombats. (PROSE: It's Raining Gin [+]Loading...["It's Raining Gin (novel)"]) It was once inhabited, as an ancient structure known as the Temple of the First was located there. (GAME: The Edge of Time [+]Loading...["The Edge of Time (video game)"])
Behind the scenes
By Occam's razor, the intended reference is simply Metebelis III. Many references have been made to that planet in the DWU since the Jon Pertwee era ended.
Thus, it should be inferred that this is the language of the Eight Legs.