When a performer or speaker intentionally drops/throws the microphone on the floor after an awesome performance.
President Obama this past weekend addressed the Congressional Black Caucus and told them to stop complaining, stop grumbling, stop crying, and help him fix the economy and get reelected. Though, I'm not sure if the mic drop was necessary.
When you drop the microphone as a demonstration of facts and the truth to a person who is loud and proud in their ignorance of both. Syn: Neal deGrasse Tyson.
“… the earth isn’t f&*(&$# flat. And by the way, this this is called gravity. Mic drop.” Neal de Grasse Tyson, the Nightly Show, January 27, 2016.