What do "A" and "E" mean (Mariah Carey's song Obsessed)?

She says she is in the A, a nickname for Atlanta, Georgia, because Jermaine Dupri is from there. He is the Jermaine mentioned in the song. As you may be aware, he is a producer and she has worked with him many times. I'm pretty sure they are good friends. She said that she worked with him for her album Memoirs Of An Imperfect Angel, but none of those songs made it on the album. E is a common nickname for the drug Ecstasy, as people here have already said.