This term is coined from the 1992 Film "The Fly" starring Jeff Goldblum. His character, after turning into the violent and hideously rotting creature that was a genetic cross between a man and fly, was known as "Brundle Fly".

Thus, this hideously rotting and stinking pile of flesh can be turned towards a female vagina in some cases. Hence, Brundlepussy.
Dude, she looked good but when she took off her pants she had bad brundlepussy, I could not hit that thing it stank so bad.
by Hunkasaurus Chunk May 4, 2009
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