dim prawn Share definition Flag A penis that is both small and incapable of attaining an erection. Is that a new Audi A5, you've bought your wife? Got 'dim prawn' again? Just as well I'm giving her what she really wants. dim prawn by cuksocker November 9, 2010 0 0 Get merch Get the dim prawn mug. Buy Now — $32.95 See more merch