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.
A crazyexcuse for making lies to someone when they think you are being serious.
Katie: Brandon LOL nice wheelchair!!! hope you roll off a cliff!
Brandon: wow.. that's so uncalled for
Katie: I'm pranking brando cool out
Brandon: Oh haha cool! that's fine !! love u katie !!!!
Not entirely involved to "Prang" but in fact refer to normally a gorgeous tanned girl with a big personality. A Prangie is normally amazing in bed, possess such great hair, and a smile that makes you melt. She's amazing all around.