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An evangelist who visits discussion groups, especially those used by other faiths or multi-faith groups, posts religious tracts, and doesn't bother contributing to or even reading the follow-up discussion. An example of the theospammer is the Islamic "lorrainelee" from Yahoo Groups, who regularly spams the Pagan and Gothic-lifestyle groups.

Also known as espamgelists and Manic E-Preachers.
Someone please ban that theospammer!
by Dave July 09, 2004
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