drop the mic

1. To dramatically drop one's microphone (or, often, to mimic such a motion) after a particularly decisive or impressive performance, action, or statement. Did you see him drop the mic after that rap battle? Right in the middle of the meeting, she exposed her boss's crooked dealings, announced that she was quitting, dropped the mic, and walked out of the board room. After a rousing speech at the pep rally, the captain of the football dropped the mic and motioned for everyone to get up and chant along with him.

2. By extension, to perform a decisive or impressive action. Dude just dropped the mic with that dunk! Wow, she basically dropped the mic when she revealed exactly why each other candidate is unfit to be mayor. Even though the Owls had finished with the best record in the league by far, their upstart playoff opponents dropped the mic on them with a four-game sweep.