Enter the whatitmeanstome code and activate it between ten to twenty times. This will result in you reaching level 50, and gaining about $5 million. Then, enter the character abilities screen to buy all the fall, fire, bullet, explosion, and vehicle strike damage reduction options until it reaches "Never take damage". This is basically gives you complete invincibility from all damage. However, a minor glitch may occur if you are in a normal vehicle and are run over by a tank or if you crash with an aircraft and you may still die. However for all intents and purposes you are invulnerable.