1 definition by Admiral Rackbar
In a school environment, to turn another person's backpack inside out after removing all the contents. Then, the contents are placed back inside and the backpack is re-zipped inside out.
Bob: "Yo did you hear what happened 6th period?"
John: "No, what?"
Bob: "Willie sacked Steve's backpack when Steve was in the bathroom."
John: "That blows."
John: "No, what?"
Bob: "Willie sacked Steve's backpack when Steve was in the bathroom."
John: "That blows."
by Admiral Rackbar May 5, 2010