- wrinkle
A wrinkle-bellied whore ; one who has had a number of bastards : child-bearing leaves wrinkles in a woman's belly.
To take the wrinkles out of any one's belly ; to fill it out by a hearty meal.
You have one wrinkle more in your arse ; i.e. you have one piece of knowledge more than you had, every fresh piece of knowledge being supposed by the vulgar naturalists to add a wrinkle to that part.
The 1811 Dictionary of the Vulgar Tongue.