ok for those of you reffering to a bike, switch on a bike is having your other foot foward when you ride, opposite is when do do a trick normal footed but in the opposite direction you normally would, and goofy on a bike is a little harder to explain but ill give it a shot, e.g.: if you ride right foot foward then you should spin to your left, if you spin to your right then you spin goofy, or barspins if you spin them the same way you spin 180s/360s its considered goofy because spinning them opposite of each other is easier. all of that was terms of being on a bike so just when you mention bmx terms you use them correctly so you dont confuse everyone, thanks.