A member of the Italian fascist party before World War II. Now used to describe any neo-nazi, right-winger, or fascist in general.
And you decked some fucking blackshirt who was cursing all the Yids. --Shane MacGowan (The Pogues) in "The sick
bed of Cuchulainn"
by Megan Keith March 24, 2006
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Based on the term redshirt, but the newly introduced character becomes evil. See Buffy the Vampire Slayer
The nerdy kid at the high school made a pact with the devil and went all Carrie on the class, total blackshirt.
by nickbeat1 October 15, 2013
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Slang term for a fascist.

Benito Mussolini's gang/private army.
Guy#1: Why is that guy so racist?

Guy#2: He's a blackshirt.
by Reallyreallynotfair September 4, 2011
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