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3.
revolutionary anarchist street tactic where participants engage in direct action against the forces of corporate and state repression, dressing as the indigenous zapatista rebels of chiapas do, in black with bandannas or balaclavas. also the bane of bed-wetting conservatives, cry-baby liberals and ignorant neo-fascists alike, many of whom have been upstaged or bitch-slapped by the black bloc with extreme vigilance.
"The Black Bloc pissed all over George Bush's inaugural parade in January, 2001."
by evil March 30, 2004
 
1.
a bunch of wankers that think being violent will stop the police from being "brutal"
dumbass: hey im gonna go kick this cop in the back of the leg and run away because im a badass teen with a political agenda

dumbass2: kickass idea.

riot cop: so yeah guys let's pack up and go home the crowd is peaceful...*gets kicked* ALRIGHT GUYS LETS CRACK SOME SKULLS!

dumbass3: POLICE BRUTALITY QUICK FILM IT WITH YOUR CELL PHONE AND POST ON YOUTUBE!

dumbass1: HAHA TAKE THAT ESTABLISHMENT! TAKE THAT SYSTEM! A COP HAS A SLIGHTLY SORE LEG BECAUSE OF ME, MY LIFE IS NOT WORTHLESS! black bloc kicks ass.
by Abdul Baari February 07, 2008
 
2.
rightwing pissants, police cadet wannabes and neo-nazi skinheads who pose as anarchists and smash up stuff at protests in order to justify security crackdowns, roughly the same political agenda as the blackshirts and brownshirts of the 1930s.

If the black bloc weren't pissants, they'd do their thing on their own, rather than during peaceful demonstrations.
At summit conferences in Genoa, Pittsburgh, and Toronto, the 'black bloc' was abetted by police.
by Figleaf23 July 01, 2010
 
4.
during protests, the black bloc is the group of anarchists on their bikes wearing black hoodies with the hoods on, and a bandana over their face so only their eyes show. They are usually spotted heading off on breakaways and they do things like smash windows of corporations, refuse to obey police orders to disperse, and fight back during police brutality. However, they do not do this just for fun, or because they are bored. They have political agendas that no one agrees to accept or consider so they revert to agression to pique interests. They are also very much against the cops. Usually, Black blocs will erupt with their messages during critical political times (i.e. going to war with Iraq)
Here in San Francisco, the black blocs show up for just about every single protest, and they organize breakaways. However, they usually fail to incite any kind of rioting, save the one right after the first bomb was dropped in Iraq. Then, they shut down the financial distrct of this city, even though it had no affect.

What happened to the times when black blocs did REAL riots with and REAL damage???
by rise up rise against June 12, 2004
 
5.
Super cool punk/anarchist activists that wear black hooded sweatshirts and face-masks to protests and break shit at Starbucks.
The black bloc broke the windows at Starbucks.
by chimaera January 22, 2003