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When a person is acting so crazy they remind you of a chimpanzee acting out at the zoo. This generally includes intense physical as well as verbal expression of emotion.
"She was going chimpcraycray after she caught her boyfriend cheating on her."

"He went chimpcraycray when he got fired."

"When the home team won in overtime, everyone went chimpcraycray."
by Frankalicious-So-Delicious December 06, 2013
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