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1.
An explosion of nostalgia after remembering a past experience by listening or watching something
I just had a nostalgiagasm last night after I heard they're remaking Pokemon Gold and Silver.
by Lackie-Chan March 09, 2010
 
2.
An experience of nostalgia so intense as to reach the pleasure levels of orgasm.
Hey, did you see Zack Morris on Jimmy Fallon last night? Total nostalgiagasm!

I was playing Secret of Mana on the Wii Virtual Console and had a nostalgiagasm. Buying Super Mario RPG now!
by Takfam June 09, 2009
 
3.
noun to find oneself excited to the point of orgasm while experiencing something from ones past.
Dude I was playing Earthworm Jim and I had a nostalgiagasm.
by MunkyBrain69 July 08, 2010