Definition of mumble-jumble in English:

mumble-jumble

verb

rare
  • with object To utter indistinctly and incoherently; to babble.

Origin

Mid 19th century; earliest use found in Frederick Marryat (1792–1848), naval officer and novelist. From mumble + jumble, perhaps after mumbo-jumbo.

Pronunciation

mumble-jumble

/ˈmʌmblˌdʒʌmbl/