The Free On-line Dictionary of Computing (30 December 2018):

penis war
Dick Size War
DSW
IRC penis war

    (Or "Dick Size War", "DSW") Any argument which
   has degenerated into quantitative boasting of the sort "My
   [program|bot|etc.] is [faster|meaner|etc.]  than yours!".
   Generally as unconstructive (and with as little emphasis on
   empirical proof) as men debating who has the biggest penis.

   The term is often used on IRC, news:alt.sysadmin.recovery,
   and sometimes applied to IRC botwars, because of their
   equally pointless nature.

   (1999-07-14)