The Collaborative International Dictionary of English v.0.48:

Scribble \Scrib"ble\, v. i.
   To write without care, elegance, or value; to scrawl.
   [1913 Webster]

         If Maevius scribble in Apollo's spite.   --Pope.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Scribble \Scrib"ble\, v. t. [Cf. Scrabble.] (Woolen Manuf.)
   To card coarsely; to run through the scribbling machine.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Scribble \Scrib"ble\, v. t. [imp. & p. p. Scribbled (-b'ld);
   p. pr. & vb. n. Scribbling (-bl[i^]ng).] [From Scribe.]
   1. To write hastily or carelessly, without regard to
      correctness or elegance; as, to scribble a letter.
      [1913 Webster]

   2. To fill or cover with careless or worthless writing.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Scribble \Scrib"ble\, n.
   Hasty or careless writing; a writing of little value; a
   scrawl; as, a hasty scribble. --Boyle.
   [1913 Webster]

         Neither did I but vacant seasons spend
         In this my scribble.                     --Bunyan.
   [1913 Webster]

WordNet (r) 3.0 (2006):

scribble
    n 1: poor handwriting [syn: scribble, scratch, scrawl,
         cacography]
    2: an aimless drawing [syn: scribble, scrabble, doodle]
    v 1: write down quickly without much attention to detail [syn:
         scribble, scrabble]
    2: write carelessly [syn: scribble, scrawl]

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

scribble

   To modify a data structure in a random and unintentionally
   destructive way.  "Bletch! Somebody's disk-compactor program
   went berserk and scribbled on the i-node table."  "It was
   working fine until one of the allocation routines scribbled on
   low core."  Synonymous with trash; compare mung, which
   conveys a bit more intention, and mangle, which is more
   violent and final.

   [Jargon File]


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

scribble
 n.

    To modify a data structure in a random and unintentionally destructive way.
    “Bletch! Somebody's disk-compactor program went berserk and scribbled on
    the i-node table.” “It was working fine until one of the allocation
    routines scribbled on low core.” Synonymous with trash; compare mung,
    which conveys a bit more intention, and mangle, which is more violent and
    final.