It's called Biker Face.
Biker Face: Adj. "The face made by an old, leathery, chain-smoking, biker chick when attempting to be uber sexy.
Biker Face is achieved by sucking in your cheeks, pouting your lips, and smizing (a la Tyra Banks).
P.S. The shirt my sister is wearing is self-produced and features a picture of her eating some green beans with the words "Corduroy Skirts Are A Sin" printed below. She also made one for me in gray. What a kid. If only I could be half as cool.