There are different records of this song and as far as I know, no version contains exactly the same lyrics. When I was listening to this live version,
I heard the following sentence, which makes much more sense in my opinion: "I've been up the river, the place they call "sing sing". Check out the idiom "up the river": https://en.wiktionary.org/wiki/up_the_river and the Prison "sing sing": https://en.wikipedia.org/wiki/Sing_Sing