Occupy Wall Street movement: Yelling “mic check” mobilizes Occupiers into a game of political repeat-after-me, uniting the crowd and spreading the speaker’s comments without amplification.
Speaker: Mic check! I want to bring up the issue of the police.
Crowd in unison: I want to bring up the issue of the police.
-Tapping a woman on the forehead with one's erect penis, often accompanied with a self-provided popping sound. It is even more amusing when the woman isn't expecting it.
Roaring/Yelling at the top of your lungs while simultaneously grasping your phallus, shaking your tongue, and ejaculating all over the place. Normally done while standing for a better experience.
(1) Seth performed a mic check to re-establish his dominance.