1) An arbitrary declaration or description of a noun, usually an event or a women, in order to give no further information.
2) A scale by which to describe something that in no way involves numbers in any way.
John: Yo, look at that chick.
Paul: Ehh, she's like a 5 at best.
John: Whatever man, she's at least a 7.
Anthony: So on a Scale of 1 to 10 how was your day?
Jackie: On a scale of 1 to 10, it was pretty awesome.
Anthony: That made absolutely no sense. But I like it.