The loose skin of the upper arms which movement becomes apparent in certain high-wind conditions.
"I was driving with the windows down, and the sun was at an angle such that I observed a fluttering shadow out of the corner of my eye. I thought, 'my goodness! There's an animal in the car!' Y'know, like in Arizona, people worry about snakes getting into their cars. So I pulled over and...nothing; turns out the shadow was just my flying squirrels whippin' in the wind."
After a girl is done giving you head she keeps your cum in the side of her cheek tricking you into thinking she swallowed it. Then when you kiss her she spits it back in your mouth.
Ashly gave me the best head the other day, but just when I thought it was ok to kiss her that ho squirreled me!