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1.
A contact in your phone that you have no memory about. Maybe some one you met on a night out and had a memorable feature about them that (at the time) you thought would trigger your memory the following morning.
John: "Hey who's this contact in your phone "Sexy Sally from the bar"

Chris: "Oh that's a Fish Pie Sue I have no idea who it is."
by Bill with the nice trousers May 09, 2013