When you are going down on a chick and she is getting close to climaxing, you lift her bottom and torso area so that her head is lower than her waist (think 45 degree angle) and you dump pop rocks and cola in her chewbacca and you shake her pelvis around. It helps her reach climax faster and it's an awesome sciece project.
When the girl your having sex with has an overly large bush and your spray it down with her hairspray and light it on fire as your having sex with her....
Cliff finially had sex with his girlfried and it was so bad he had to perform the flammingchewbacca....