Ha, yeah, I can see the potential annoyance with the term ESP.
I would agree with Varg, something you experience that didn't seem to fit the senses of, touch, taste, smell, vision, hearing, body mechanics, infrasound/air pressure, etc, that comes from outside yourself, yet is not something you can touch directly.
I did a quick check to see if the topic had been discussed, but I didn't do a good enough job maybe?
Sorry if I posted a topic on ESP and yet it has already been done before.