job security

job security n.  When some piece of code is written in a
   particularly {obscure} fashion, and no good reason (such as time
   or space optimization) can be discovered, it is often said that the
   programmer was attempting to increase his job security (i.e., by
   making himself indispensable for maintenance).  This sour joke
   seldom has to be said in full; if two hackers are looking over some
   code together and one points at a section and says "job
   security", the other one may just nod.