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1.
To predict the nostalgia that will come from something that hasn't happened yet or that is happening now.
Like missing someone before they're gone.
- You know, once you guys are living in London, I'm gonna come visit you and we're gonna look back on these years and say those were some pretty awesome times.
- Ya, I think I miss this already.
- Me too.
- Aw, I can't take all this prestalgia.
by Philmography September 03, 2009
 
2.
the sensation of nostalgia while experiencing the event that you should be nostalgic about
I felt prestalgia about the birthday party
by allen3 November 13, 2012