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1.
A state that is reached when one has run out of options. Usually takes place in a social situation when you cannot play possum and are forced to talk to somebody you do not want to speak to. Usually makes the victim appear as a "mannequin" in a completely frozen position.
Psycho Chico/a: Why was it when I went in to kiss you, you froze?

Normal Person: It's a defense mechanism, when I can't feign sleep or death I go into mannequin mode.
by Davey December 04, 2004