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When a large breasted woman lands chest first into water.
Pamela Anderson miscalculated her dive off the boat and the thwack from her breast flop reverberated through the canyon.

Pamela: ouch!
Tommy: huh huh.
by mshell March 26, 2007
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Joe: Arnold Schwarzenegger was a hippie!

Moe: What does that have to do with the article you breastflop!
by bojzzle December 24, 2006
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