To me this is about marriage and a woman who is engaged to be married to the wrong man. "I am posssessed, still engaged". She is his possession, engaged to be married. "Time bomb in his palm, a finger apple" might refer to the engagement ring, a time bomb waiting to explode on the day of their marriage, a ring in his palm, put on her finger, like the apple in the garden of Eden it promises good things but doesn't deliver. "Advanced shackling" - a physical shackle is used to hobble an animal like a horse to stop it from running away. She is potentially a "fast horse" who can run away from this unhealthy situation, but because she is mentally shackled she doesn't leave him.
To me this is about marriage and a woman who is engaged to be married to the wrong man. "I am posssessed, still engaged". She is his possession, engaged to be married. "Time bomb in his palm, a finger apple" might refer to the engagement ring, a time bomb waiting to explode on the day of their marriage, a ring in his palm, put on her finger, like the apple in the garden of Eden it promises good things but doesn't deliver. "Advanced shackling" - a physical shackle is used to hobble an animal like a horse to stop it from running away. She is potentially a "fast horse" who can run away from this unhealthy situation, but because she is mentally shackled she doesn't leave him.