When two or more obese peopleget sexually aroused and have a hankering for cheese and have sex in a fountain of cheese, thus when walking by the fountain it appears to be cheesy flapjack.
The lovely obese couple looked like a "Cheesy Flapjack" inside the newly weds nacho cheese fountain.
When a man squats over a large vat of processed nacho cheese sauce, dipping only his testicles into the cheesy slurry, requiring that his partner will then lick off the cheese from his testicles. The cheesy double.
Stan: I heard that girl you got with was a total freak?
Frank: Yeah I had to call it an early night. She kept on insisting we try out the cheesy double and you know I'm lactose intolerant.