back oven

Based on the idea that a pregnant woman has a bun in the oven at the front, a back oven refers to the back passage, usually of a gay man. It can refer to an empty or full back passage.

“Hey Martin, I have just put a batch of Vegan brownies in the Aga. While they cook, would you like to repeatedly and passionately enter my back oven against the kitchen work top?”

“Why yes, Bradley, I would!”

back of the oven

Something or someone so detestable that it literally has to go to the end of the line to be exterminated. Typically used in the context of something fascists would find absolutely abhorrent because it combines multiple hated attributes or despicable actions, like a mulatto communist, or transsexual child molester. From the old joke listed below:

Q: Why was the Black Jew sad?
A: Because he had to sit in the back of the oven.

Did you see that drag queen waving an Israeli flag and handing out dildo lollipops to children? Some real back of the oven shit there.