First get Jango Fett. Then go to colleage(multi-player or single).
Go to the place where you have to knock down the jocks. When your through the door turn right and go to the left side of the ramp. When your in the air do jango jump jet. You'll be floating in the air!!!
Do any tricks you want. Just make sure you dont stop spinning or you'll go back down. I hope you have as much fun as I did with this cheat.