Prison bottom surprise
The act of soiling oneself while in prison to avoid becoming a cellmates sexual toy.
John went to jail, but he managed not to get raped by giving them the old prison bottom surprise.
prison bottomed
An abused rectum that has been subject of excessive poundings. Possibly by more than one person at a time.
"Hey, I got a date with that barista!"
"Yo dude, I heard she's prison bottomed"
"Yo dude, I heard she's prison bottomed"