Sasha, for the sake of modesty, you need to use your imagination.
He brought in $500 into the prison.
It was jammed up somewhere = it was stored somewhere, as in jammed/forced into a small space
Back porch . Well it's not a veranda in this case. It's part of his body, at it's at the back, and...and discrete. дно? ягодица.
I loved the movie. It is shown too much on TV though.