What is Gappage?
1.
The area that forms between a girls legs and her ass when standing in an upright position.
"Check out the gappage on that chick" or "Oi fellas, you could park a mini in her gappage, have a look!"
2.
Moving quickly finding a new route maneuvering though gaps before they close
Driving down the motor-way weaving in and out of gaps forming the most efficient quickest route
Performing gappage
See