A euphoric rush from playing video games, watching Star Trek, or any other activity typically considered "nerdy" which is comparable in intensity to an orgasm. The phrase "all over the place" can be added to the end to denote an even more intense feeling, though no bodily fluids are actually involved.
That feeling you get when you run your fingers across a perfectly new, untouched, just opened glossy surface for the first time and it makes that squeaky sound.
Ashley: I just opened my new iPhone. *peels the film off*
Jake: can I touch it?
Ashley: umm.. Jake, I'm pretty sure you just had a newgasm