A woman so hot that you'd be willing to cut your own arm off as portrayed in the film 127 Hours just for the chance to sleep with her.
You: Whoa! Oh my God. Did you see that chick in the red dress coming off the elevator?
Me: Hell yeah, I did! She's a definite 127!
Professional colleague at a business meeting discreetly gets your attention as ridiculously hot administrative assistant enters the room....You flash your fingers 1-2-7 to indicate that yes, she'd be worth losing your arm over. Sexual harrassment lawsuits are no fun but you still have to be able to say what needs to be said.