When you put 2 fingers in her vagina and 2 fingers in her asshole. Then in a alternating thrusting action like the blasters of the Millennium Falcon from Star Wars, you make laser blaster sounds as well. You can also quote Star Wars while in the sexual act, like:
"Don't get cocky kid!"
"They're coming too fast!"
I was doing the the
Millennium Falcon Blasters on my girl last night and she screamed like a Tie Fighter!