Eye humping

The act of looking at a women (Or man) and fantasizing of humping her.

to think about fucking a woman while looking at her

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.

to lustfully stare at a person