The word Rapy is a derogatory term for any guy that leers at a woman in a way making her feel unsafe in the way he is capable violating women sexually by force, the act of rape. It is the next level up from someone that is Creepy.
Lana, "wow did you see that guy leering at me with that creepy smile? I got a real bad feeling about him."
Jordon, "Oh I totally agree his is a predatory type for sure, the guy is full on Rapy!"