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1.
The act of reaching orgasm from looking at locations on a map.
He was so impressed with the map he created he had a geogasm. It was a work of art.
by Mapman February 14, 2014
 
2.
The act of getting an orgasm from too much geology happening around you at any given time. May come out of nowhere.
While looking at the Gniess AsS (Realgar), I had a geogasm.
by Rehcra SCW BTW November 07, 2013