Top Definition
The almost orgasmic feeling one has after watching an exciting episode of Battlestar Galactica.
Kevin could not sustain a galactigasm after Adama's brilliant handling of the Cylon threat.
av Dane Roberts 9 december 2006
1 more definition
When something on Battlestar: Galactica gives you nerdgasm.
Person (1): dude did you see what Adama just did? He just dropped the Galactica and jummped!

Person(2):"Galactigasm"
av Mr. Vincent Boombotz 25 mars 2009

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