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to flip out, to lose your cool, to lose control, go bananas

originating from Captain Kirk due William Shatner's penchant for over emotive acting:

Capt. Kirk to Spock: "All right, you mutinous, disloyal, computerized half-breed. We'll see about you deserting my ship."

"Rabbs kirked out when he ate the chocolate matzah."
by laxshlee October 19, 2007
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