Jabberwocky

Jabberwocky was a poem by Lewis Carroll. It was about a boy killing a monster and contained a lot of nonsense words.

While working on Bessie, the Third Doctor sang the first few lines of Jabberwocky. (DW: Doctor Who and the Silurians)

During his confrontation with Light, the Seventh Doctor mentioned bandersnatches and slithy toves, which were creatures from the poem. (DW: Ghost Light)

The Doctor loved the words "burbled" and "tulgy", which originated from the poem and which he thought were good for describing woods and puddings. (NSA: The Nightmare of Black Island)