Source : Webster's Revised Unabridged Dictionary (1913)

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.

   2. To fill or cover with careless or worthless writing.