No need to apologize; I’d be glad to explain it for you. :)
Repression, in psychology, is when someone subdues a desire or excludes it from their consciousness. The repression, for the girl, came from the octopus growing between her lungs-it was tiny and hidden, and no one knew it existed until the coroner found it.
I used the hidden octopus as a metaphor for repression-it was something that she kept tucked away, out of sight from the outside world, inside of her. The octopus was like a desire that a person tries to put in the back of their consciousness in order to repress it.
So the octopus was a metaphor for the girl’s repression. But what, exactly, she was trying to repress is up to the reader’s interpretations.
I hope that made sense!
Have a great day. :)
(If anyone else wants to read this poem, it’s here: http://writingsforwinter.tumblr.com/post/42487504268/all-the-psychology-textbooks-say-repression-doesnt)