the right wording is:
al-taharrush /el-taharrush
it is a rape flashmob,
https://de.wikipedia.org/wiki/Taharrush_gamea
study:
http://harassmap.org/en/wp-content/uploads/2013/03/Reconceptualizing-Sexual-Harassment-in-Egypt.pdf
http://harassmap.org/en/resource-center/research-studies/