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The state of being highly sexually pleased by the extremely British voice of Hugh Grant, which afterward usually results in a painful hangover and aversion to low-class Continentals
"I daresay Reginald, I do believe that Love Actually is the best Britgasm I've ever experienced."
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1. The high elevation of pleasure felt when experiencing any Britney Spears-related joy.

2. The adrenaline rush and amazing feelings before, during, and after going to a Britney Spears concert.
-Were you at the Britney concert last night ?
-Yes, and I'm still having a Britgasm.
by Britgasmic April 03, 2009
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