Intermittant Paroxysmal Attractiveness, a term used to reference a woman or man who is intermittantly suddenly attractive. This usually ocurrs without warning and frequently disappears just as fast. Similar to a "two-face". An example would be when a girl comes in to work one day totally dressed up with her hair and makeup perfect but is usually not attractive.
Holy shit, did you see Jenny today, damn she looks good, that bitch has IPA!