A device used in verbal arguments, or in everyday life to catch a laugh. The word comes from Mimicing-Sarcasm, Mimicasm although it is not strictly sarcasm. The way in which the mimic is used, in a sarcastic tone. A brief way to interupt the rythym of somebodys debate.
'A meeting, where a person of authority is in the wrong, and tries to ramble and get out of it'
Person of authority: I think that this and that...
Opposer (In the person of authoritys voice, sometimes joined with some sort of hand signal): I think that you should shut the hell up!
Bystander: He got him with a Mimicasm then