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1.
Experience of an orgasm while watching a film. Most commonly caused by the appearance on screen of hot actors, thus creating sexual tension, and resulting in filmgasm.
Example:
Twilight was a ridiculous movie, but I filmgasmed the whole way through
by MoMaMo November 30, 2008
 
2.
The feeling you get while watching a very, very good movie, or movie scene....
"I got a filmgasm while watching V for vandetta"
Or
I got a Filmgasm when watching the Slow motion scenes in 300
by arnthor Ingi March 27, 2007