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1. To run in, stick in the penis, ejaculate, and quickly exit.

2. Term often substituted by "Quickie". A Quick Sack is where one quickly gets another in a "Sack" and proceeds to intercourse... Quickly.
"She wanted to do it, and I just wasn't in the mood, so I ran in, quick sacked, and went back to watching "Scrubs""
by Balls Hard December 13, 2009
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