pessimizing compiler

pessimizing compiler: /pes'*-mi:z`ing k*m-pil'r/ n.  A
   compiler that produces object [antonym of `optimizing compiler']
   code that is worse than the straightforward or obvious hand
   translation.  The implication is that the compiler is actually
   trying to optimize the program, but through excessive cleverness is
   doing the opposite.  A few pessimizing compilers have been written
   on purpose, however, as pranks or burlesques.