Full code status means that all possible measures are taken to revive a person and sustain life.
"Full code status" means that if you have cardiopulmonary arrest, that is if you stop breathing or your heart stops beating, the medical team will do everything in their power to bring you back such as defibrillation (shocking with paddles) giving drugs to start your heart, putting you on a ventilator etc....
I hope that this has helped, Sunny :)