Aerodynamics With Underwear

This occurs when you throw underwear or other articles of clothing down a flight of stairs into the laundry hamper. The underwear would sometimes glide or turn slightly and miss the hamper.

I was doing aerodynamics with underwear and the underwear missed the hamper and landed in the front porch

Aerodynamicity

How aerodynamic a thing (or a person) is

Person 1: "I am very aerodynamic"
Person 2: "Nah! I have more aerodynamicity than you"

aerodynamic

A description used to define cleanly shaven legs or other body parts. Smooth enough to quickly move through water.

“Girl! I just shaved! I’m practically aerodynamic!”