A fork of Rural Dictionary
A sack is a high school prank. This is how its done.
Step 1: Grab someones bookbag.
Step 2: Empty out the bookbag.
Step 3: Turn the bookbag inside out.
Step 4: Put the books back in.
Step 5: Zip up the bag, and have the metal zipper holding things on the inside of the bag
Guy: haha, that kid just got sacked.
Guy 2: owned