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Slang for when you bust a nut.
Rob: "How did your date with Mandy go last night?"

Tom:"Pretty good, she took me back to her place."

Rob: "Get a HJ or bang her down?"

Tom:"Na, neither, got a BJ and I accidentally Bust A Sack-Full all over her dress."
by Not that guy! October 13, 2009
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2
When you gotta sack full of slimy cum and it comes out all at once.
Hey mom, I just busted a sack-full. *Bust a sack-full*
by BootyWanter January 21, 2017
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