When a male tucks his genetalia behind his legs to make himself look barren from the front, but when you view him from the back it appears his ass has a bunch of grapes hanging from it because the penis and balls have been suffocated between the legs.
Joe gives himself ass grapes just like Buffalo Bill did in "Silence of the Lambs."
The large open space on the forehead of a gaper between the helmet (or hat) and goggles while skiing/riding. Also visible days after in the form of a sun burn or wind burn on the forehead.
Gaper: Man, my forehead got fried skiing this weekend!
Local: You need to pull your helmet down and cover your gaper gap.