Often used to describe a crack cocaine addict;

Prang being Chang/Charlie/Coke
Cat being an addict

Also -

Used to describe a man that is scared of someone or something, usually an addict too.
'Look at that prang cat picking up fag butts from the floor'

'Munir's such a prang cat, he's scared to even drive through the ends'
by prangster October 19, 2007
Get the prang cat mug.