Prang by itself usually refers to a car park-type ding. A freeway pile-up with 14 fatalities is a "nasty" prang.
"Ha, dunno mate-sounds a bit prang"
(2) 'Man's been up for three days smokin' that shit, geezer's proper prang, should go home, take a shower and sleep.'
(3) 'Man, I'm prang, let's get out of here, it don't feel right.'
To worry or panic, often used to refer to paranoia induced by smoking weed, but can refer to worrying/panicking when sober. A synonym is sketch.
2 <noun> a prang
A small car crash or scrape. Sometimes also used to describe a more severe car crash, when trying to make it sound less serious.
2 "Sorry, I can't drive you to work tomorrow, the car's at the garage after a little prang I had yesterday."