spaghetti code

from Jargon File (4.4.4, 14 Aug 2003)

spaghetti code
 n.

   Code with a complex and tangled control structure, esp. one using many
   GOTOs, exceptions, or other `unstructured' branching constructs.
   Pejorative. The synonym kangaroo code has been reported, doubtless
   because such code has so many jumps in it.

from The Free On-line Dictionary of Computing (8 July 2008)

spaghetti code
kangaroo code

   <programming> A pejorative term for code with a complex and
   tangled {control structure}, especially one using many
   {GOTOs}, {exceptions}, or other "unstructured" branching
   constructs.  The synonym "kangaroo code" has been reported,
   doubtless because such code has so many jumps in it.

   [{Jargon File}]

   (1997-02-17)