From de- + sysop.
desysop (third-person singular simple present desysops, present participle desysopping, simple past and past participle desysopped)
- (transitive, wiki jargon, chiefly Wikimedia jargon) To revoke the sysop (administrator) privileges of.
2010 July 6, Eric Stevens (quoting Wikipedia Arbitration Committee), “Re: Wikipedia Accuracy”, in soc.history.ancient[1] (Usenet):William M. Connolley desysopped
2010 December 6, robert bristow-johnson, “boy, is *this* OT. but i'm game. (was Re: Imbecility)”, in comp.dsp[2] (Usenet):i'll admit that i am flypaper for abusive admins. it's because i simply don't take shit from them. some of these abusive admins were eventually desysopped […]
2011 August 5, Ding Dong [username], “Re: All My Details”, in uk.legal[3] (Usenet):Eventually he'll be desysopped for good, and that will be a wonderful day for reason and honesty on the Internet.