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1.
Already defined, but additional information is needed.

This is generally utilized by mindless people who don't think for themselves and therefore simply repeat the statements of others. It involves zero intelligence and simple following of what your professors taught you. It's the opposite of free thinking and rebellion.
The Human Microphones simply repeated mindlessly the people egging them on without thinking for themselves. They aren't too bright.
by Mako34 October 19, 2011
 
2.
A tactic protesters can use to circumvent police bans on electronic amplification of speech. One person starts to speak to a large crowd. After a short sentence, everyone within hearing distance repeats whatever was said at the top of their lungs, allowing people outside of hearing distance to hear the speech.
The Human Microphone on Wall Street announced this speech:

"Mic Check."

"MIC CHECK!!"

"The human microphone is slow and cumbersome"

"THE HUMAN MICROPHONE IS SLOW AND CUMBERSOME!!"

"but it really makes you think through"

"BUT IT REALLY MAKES YOU THINK THROUGH"

"what it is you want"

"WHAT IT IS YOU WANT!!"

"to say."

"TO SAY!!"
by Occupy Urban Dictionary October 10, 2011