When you are either at the top or bottom of escalators that go opposite directions at the area where the railing is parallel to the ground with escalators that go opposite directions. You then lie down on the railing on your back and the belts going opposite directions cause you to spin in circles.
The act of pulling ones tampon out and vigorously twirling it around above your head in a helicoptering motion, whilst makes sure adequate blood contents are splattering around accordingly.
Trev: Dude, how did you go with that chick?
Dan: Ah man, went down on her, but she was packing heat!
Trev: FUCK MAN! Tampon?!
Dan: Yeah man...but you know what I did!
Trev: Helicoptered that bitch??!
Dan: YOU KNOW IT! Was helicopterin like a mother fucker! *high five*. Her walls will never be the same.