A fork of Rural Dictionary
GP is a word used by roller-coaster enthusiasts, and simply means General Public (as in what non-enthusiasts would say/do). The word is also used as a gatekeeping measure by some enthusiasts from letting their passions be flooded with non-enthusiasts. NOTE: People in videos tend to say 'general public'.
1) Nemesis, at Alton Towers, is a ride not just popular with enthusiasts, but with the GP as well. 2) If you don't know what GP means, you're GP.