Top definition
A computer showing the symptoms of a virus infection; turtle-slowness, inability to run certain apps or games, inability to browse through the internet or very slow internet browsing, and certainly will end in you having a high blood pressure.
A: My windows has a systitis for the last month.
B: It's probably because you're running an update-disabled fake version. Buy a genuine version, or replace your windows with any open-source os.
by Ahmed Zidan October 26, 2010
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