Eye-hump
To stare at someone in a creepy, sexual way, usually for several minutes without blinking or stopping when the person being eye-humped realizes he/she is being mentally undressed (and doesn't even want to think what else) by the eye-humper. If done right, very unnerving.
eye-humping
Example:
I'm not a jealous guy, but I don't appreciate it when cats be blatantly eye-humping my girl.
I'm not a jealous guy, but I don't appreciate it when cats be blatantly eye-humping my girl.