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When your feeling high on coke. This is the name of one of Mike Skinners (The Streets) songs and he explains it here at this link.
The word chang means cocaine and prang means agitated or fear of something. So the combination of chang and prang is prangin. When your getting a buzz on cocaine.
Jimmy was prangin out last night before be passed out on the couch.
by Isaac LeMasters July 07, 2006
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