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a tiny rock-filled sack that looks like a poopy golf ball you kick around like it owes you money
My cousin kicked the hacky sac so hard it went through the neighbor's window. I think it was laughing at him.
At recess, Sarah tried to hacky sac with her feet and got a face full of sand. Classic.
The hacky sac was so annoying, I threw it at the teacher. It hit her in the head. I got detention. Worth it.