Listening to or observing a mixed set of tracks. DJs and clubbers who tend to observe and analyze the method and sound of the DJ are known as trainspotters.
standing in front of a dj while they're playing a set in order to find out every detail of the record they're playing. this is done so a person can go out and buy said record then play like they found it on their own.
DJ: Dude, stop trainspotting my records! Can't you find some to buy on your own?
Trainspotting occurs whilst on large doses of m.d.m.a. or during heavy sleep(R.E.M.). Also known as shuttervision, the eyes move rapidly back and forth creating broken up images, like watching a train go by from a stationary side view...also in reference to checking out a d.j.'s set.
Standing at the train tracks and waiting for trains to come by. When people chase after the trains, it can even be considered a sport. Could this be any more self-explanatory?