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]

Moby Thesaurus II by Grady Ward, 1.0:

46 Moby Thesaurus words for "burble":
   babble, be stupid, blather, blither, blubber, boil, boil over,
   bubble, bubble over, bubble up, chatter, clack, dither, dote,
   drivel, drool, effervesce, ferment, fizz, fizzle, gabble, guggle,
   gurgle, hiss, lap, maunder, plash, plop, prattle, purl, rattle,
   ripple, run on, seethe, simmer, slobber, slosh, sparkle, splash,
   swash, swish, trill, wash, work, yak, yammer



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.


The Free On-line Dictionary of Computing (30 December 2018):

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]