Stinkgasm
When you are on the shitter and you don't have reading material so you jerk off instead, trying carefully to time your poo release with your spooge shot, leading to a stinky but wonderful feeling.
"God dammit, I forgot to bring the paper in here...(few minutes pass)...OOOHHHHHH YEEAAAHHHHH! Fuck that was a great stinkgasm"