When someone bends backwards and their body makes an
angle greater than 90 degrees.
Seen in Exorcist movies and an episode of Family
Guy making fun of a
scene from Shawshank Redemption.
Ace: Have you seen the
trailer for The Last Exorcism? That
chick bends her body into a 120 degree
angle.
Gary: That's obtuse!
Ace: Right you are, Gary.