Top Definition
The mysterious phenomenon when everyone gets a boner or a lady boner while watching a Batman movie.
Guy 1: The Dark Knight is one of the best movies I have ever seen.
Guy 2: Yeah I had a raging boner the whole movie.
Guy 1: I see that the Batman Effect worked on you too.
by icanhasnachos September 27, 2011

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The Urban Dictionary Mug

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