PHANTOM OF THE STOPERA /FANN tum uv the STOPP ruh/ noun:
The people you see at your train stop each day that suddenly disappear, but pop into your mind weeks or months later and cause you to wonder what ever happened to them.
Usage: I was kind of making eyes at this young brunette at my stop, but then she went phantom of the stopera and my commute regressed to a mirthless dirge.