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When you take a shit in a bag then throw the bag at someone
When you are at a music festival and the performance is displeasing.

Mike "Have you still got that shit bag"
Sally "No, I chucked it at Gorillaz"
Mike "Nice, was it a direct hit?"
Sally "Yeh it was a perfect shitbagging, exploded on impact!"
by Tamek Iller July 03, 2010

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