A term used to describe a task, chore or event so excruciatingly unpleasant, it’s almost beyond endurance. In other words, you’d rather have a monkey sling his chum in your face than go through one more second of this agony.
"Hey Bob, how's that project coming?"
"Oh man, Steve, I'm telling ya, I'd rather have a monkey sling his chum in my face."
"So, how did the visit with the in-laws go?"
"Like four straight hours of monkey chum in the face."