Help me identify this Chinese word?
http://www.cantonese.sheik.co.uk/dictionary/characters/266/
  
  滾 /gun3/ 
  
  [1] [v] roll; rotate; trundle 
  
  [3] [v] piss off; get out; beat it
  
  滾 / 滚 


Apparently, telling someone to "走开" (walk away) is not forceful enough. Your translator was suggesting you should tell them to "滚开 (roll away /piss off)" like an egg to express your displeasure. 

In fact, there's actually a phrase "滚蛋" means exactly that. 

滚 (roll) = 滚开(roll away)

I recommend against such a brunt language. To turn down the ladies of the night, you could simply say " 没兴趣"(not interested)/mei2 xing4 qu5/ 


  If you ask: "Why is 滚开 more forceful than 走开?" The answer is, it would be natural for people already on the ground or on their knees to roll away. Saying 滚开 implies you are in a dominating position.