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1.
A superlative life experience; instills the sensation as if one were perpetually cumming.
Having a pirate ship battle with your best friend would produce a lifegasm.
by piratebooty September 14, 2010
 
2.
Similar to an orgasm, a lifegasm is more or less an epiphany in which one has a sudden realization causing them to have this EXTREMELY good sensation.
Oh gawd, Samus is actually a girl?! I think I just had a lifegasm.

Oh wtf... Bridget's a GUY?! -lifegasms anyway-
by Haruhi October 12, 2008