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4.
when a woman performs fellatio on a man.
I didn't hit that, but she did a mic check.
by Duke February 24, 2004
 
1.
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.

Speaker: We have been protesting...

Crowd in unison: We have been protesting...
by MadRat November 13, 2011
 
2.
-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.
"Mic-check time, baby!! (pop-pop-pop) "
by Batrastard July 04, 2003
 
3.
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.

(2) Jed broke the awkward silence with a mic check.
by Moammar Gaddafi August 17, 2011