Wiktionary
rock spider
n. 1 (context West Australian slang prison slang English) A pedophile or child molester. 2 (context South Africa English) A Boer or Afrikaner.
Usage examples of "rock spider".
It was only an ordinary rock spider, no larger than the palm of his hand.
It reposed there, gigantic and globular, in the fashion of the rock spider, its legs tucked beneath it.