It's just short for "my wiki installation," unlike "my Outlook" or "my Firefox," which make no sense at all.
----- Original Message ----- From: nevio carlos de alarcão nevinhoalarcao@gmail.com
Many people here refer to the wiki managed by them as "my wiki". This is very strange, because a wiki is not particular to anyone. A wiki is owned by those who use it, don't you agree?