Top Definition
Fandom slang for the sci-fi movie Serenity based on the tv show Firefly by Joss Whedon.

Play on the character Zoe's response of "Big damn heroes, sir," to Mal's question, "What does that make us?"

Often to BDM.
I saw the Big Damn Movie before I even saw the series!
by jessie. August 12, 2006
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