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.
ayon kay Dane Roberts ika-09 ng Disyembre, 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!
ayon kay Mr. Vincent Boombotz ika-25 ng Marso, 2009