To describe a small or stunted penis, this squashes any guys ego, and ladies if you say it then the guywill prove himself, so good way of seeing his manhood.
'Oh my God, did you hear about Arthur he has a Stunted Shaun, how embarressing'
A "stunted punk" is a class of poseur of the most vile sort. Filled with grandiose malapropisms, crippled by poor hygiene and and a penchant for gagging themselves upon their own feet.