That secret bit of fanny your dad has on the sly when your mums not in the mood. Only Later to shove his leftover greasy bone in your mums recepticle when she's pekish for a bit of spicy meat, with extra mayo.
"Its finger licking good"
"My dad thought he'd give my mum a break so he went for a mums night off bucket"
"After procrastinating with his mums night off bucket, ted when back to his wife's wicked zinger."