It’s about time.
You can’t bribe time. I think that the “Jubjub” might be a chronometer. “Jub jub” makes me think of the sound of a clock escapement. You want the sound to be “symmetrical”.
From The Hunting of the Snark:
297 “Be a man!” said the Bellman in wrath, as he heard
298 The Butcher beginning to sob.
299 “Should we meet with a Jubjub, that desperate bird,
300 We shall need all our strength for the job!”
321 Then a scream, shrill and high, rent the shuddering sky,
322 And they knew that some danger was near:
323 The Beaver turned pale to the tip of its tail,
324 And even the Butcher felt queer.
329 “’Tis the voice of the Jubjub!” he suddenly cried.
330 (This man, that they used to call “Dunce.”)
331 “As the Bellman would tell you,” he added with pride,
332 “I have uttered that sentiment once.
333 “’Tis the note of the Jubjub! Keep count, I entreat;
334 You will find I have told it you twice.
335 ’Tis the song of the Jubjub! The proof is complete,
336 If only I’ve stated it thrice.”
337 The Beaver had counted with scrupulous care,
338 Attending to every word:
339 But it fairly lost heart, and outgrabe in despair,
340 When the third repetition occurred.
By the way: The bird also lurks in Carroll’s Jabberwocky (1872):
004 “Beware the Jabberwock, my son!
005 The jaws that bite, the claws that catch!
006 Beware the Jubjub bird, and shun
007 The frumious Bandersnatch!”
2017-09-19, update: 2022-10-22