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1.
mod or other forum/blog controller who cancels/stops/blocks thread due to an arbitrary law or bad mood/hangover

also person who repeatedly pulls thread off-topic or repeatedly pulls thread back ON-topic despite other posters having fun doing what they feel like with topic

not to be confused with "nazi thread" - a regular occurance at white supremacist sites
WTF?

d00d, thread nazi killed it...
by Bong Crosby February 12, 2006