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.
by Dane Roberts December 09, 2006
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2
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"
by Mr. Vincent Boombotz March 25, 2009
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