Top Definition
Post NYSF Depression. The heart breaking, and gut renching despression that strikes NYSF students on their return home.
Person#1; How are you feeling today??

Person#2; Oh, I have a terrible case of PNYSFD! :(

Person#1; ............. Check your program! :D
by Caity and JayJay January 13, 2012
The feeling you get after the National Youth Science Forum.
Post Notional Youth Science forum Depression.
I am suffering from PNYSFD now.
by snigdha1000 January 19, 2012
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