BSD:  

   A psychoactive drug, popular in the 80s, probably developed 
   at UC Berkeley or thereabouts.  

   Similar in many ways to the prescription-only medication called 
   "System V", but infinitely  more useful. (Or, at least, more fun.)  

   The full chemical name is "Berkeley Standard Distribution".

FreeBSD ('BSD'):

   It is a small Daemon wearing sneakers. It is normally found on 
   Internet servers and powerful desktops, and moves very quickly. 

   A kill of this poweful creature is enough to tick off any 
   sysadmin. It is highly magical, having the power to serve. It 
   resists DoS and SYN flood attacks. 

   Nothing is known about its attack.

   No battles to the death are recalled.