Jabber is short-hand for Jabberwock or Jabberwocky.
1872, nonsense word
(perhaps based on jabber) coined by Lewis
Carroll, for the poem of the same
he published in "Through the Looking-Glass." The poem is about a fabulous beast called the Jabberwock.
1. Jabberwocky- a playful imitation of language consisting of invented, meaningless
words; nonsense; gibberish.
2. Jabberwocky- A mysterious creature unexplained by literal
means. Figuratively, a being undefined and mysterious; subjectively determined by symbolic means.
Common Speech-"That guy is so mysterious, he's like a jabber..."
"Will you make an entrance?" "No, I think
I'll sneak in like a jabberwock."