The Collaborative International Dictionary of English v.0.48:

burble \burble\ v.
   to to make a burbling sound; -- used of water, especially
   brooks.

   Syn: ripple, babble, guggle, bubble, gurgle.
        [WordNet 1.5] burbling

WordNet (r) 3.0 (2006):

burble
    v 1: flow in an irregular current with a bubbling noise;
         "babbling brooks" [syn: ripple, babble, guggle,
         burble, bubble, gurgle]

The Free On-line Dictionary of Computing (19 January 2023):

burble

   [Lewis Carroll's "Jabberwocky"] Like flame, but connotes
   that the source is truly clueless and ineffectual (mere
   flamers can be competent).  A term of deep contempt.  "There's
   some guy on the phone burbling about how he got a DISK FULL
   error and it's all our comm software's fault."  This is
   mainstream slang in some parts of England.

   [Jargon File]


The Jargon File (version 4.4.7, 29 Dec 2003):

burble
 v.

    [from Lewis Carroll's Jabberwocky] Like flame, but connotes that the
    source is truly clueless and ineffectual (mere flamers can be competent). A
    term of deep contempt. “There's some guy on the phone burbling about how he
    got a DISK FULL error and it's all our comm software's fault.” This is
    mainstream slang in some parts of England.