[W/K] :: sig virus

  sig virus n. A parasitic meme embedded in a sig block. There was a
     meme plague or fad for these on Usenet in late 1991. Most were
     equivalents of "I am a .sig virus. Please reproduce me in your .sig
     block.". Of course, the .sig virus's memetic hook is the giggle value of
     going along with the gag; this, however, was a self-limiting phenomenon
     as more and more people picked up on the idea. There were creative
     variants on it; some people stuck `sig virus antibody' texts in their
     sigs, and there was at least one instance of a sig virus eater.
  
  

  sig virus
       
          A parasitic meme embedded in a sig block.  There was a
          meme plague or fad for these on Usenet in late 1991.  Most
          were equivalents of "I am a .sig virus.  Please reproduce me
          in your .sig block.".  Of course, the .sig virus's memetic
          hook is the giggle value of going along with the gag; this,
          however, was a self-limiting phenomenon as more and more
          people picked up on the idea.  There were creative variants on
          it; some people stuck "sig virus antibody" texts in their
          sigs, and there was at least one instance of a sig virus
          eater.
       
          [{Jargon File]