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1 definition by mikami_teru_674

 
1.
It's when you're fucking a chick from behind, and right as you're about to blow, you smash a watermelon over her head, yell "BANG" and cum all over the back of her head.
Dude, so last night I gave Patty the Big Bang, it was epic!
by mikami_teru_674 September 09, 2010