Raperdar 

The ability of short girls to spot rapers following them on streets with their friends. This ability seems to be lost on some girls mainly on the streets of large cities. Without this they must rely on their friends and boyfriends for advanced warning of impending danger.

Cera had no raperdar so she did not notice the carload of men trying to pick her up or the man that was following her for the past three blocks. so her friends had to warn her

Raperdar by Tina muller August 6, 2009

rapedar 

rapedar (Rape - Dar) :

Similar to gaydar. The feeling you get around a creepy guy that let's you know his has issues with his mother.

I don't have anything against a free drink, but that guy almost broke my rapedar.

rapedar by hucklefish April 1, 2011