Trashcan Erotica is when you pay a homeless person to have sex with you in a dumpster, and go home to write a story about it.
Guy 1: "I finally wrote my own Trashcan Erotica!"
Guy 2: "Did you fuck a hobo in a dumpster? It's not Trashcan Erotica unless you did that beforehand."
Have you read Dave's new Trashcan Erotica? It's his take on 50 Shades, but with a homeless woman.