It appears that J.K. Rowling independently invented 'Mimble Wimble' as a nonsense term in "Harry Potter and the Philosopher's Stone". One wonders at the thought process by which she arrived at the invention.
Grump tank for disgruntled atheists.
Mumble grumble, gyre and gimble, wimble wimble ... mimble wimble.
Twas grillig, and the slithy knaves
Did mimble wimble en the clave;
All quinsy were the politaves,
And the wrath trolls outrave.
Nattercrocky ... with apologies to Lewis Carrol