Noun
(uncountable, games) A game or activity in which one or a group of players try to keep a footbag off the ground using only the feet.
(countable) The footbag used for such a game.
Hacky-Sack (plural Hacky-Sacks)
Alternative form of hacky sack
hacky sack
Ahh, Earth Day, the only day of the year where being able to hacky-sack will get you laid. Jon Stewart
One outstanding customer service that it comes with the Turtle Island Imports Hacky Sack is once the quality of the hacky sack is out from its original form, you’re getting a refund and an extra $10 for your trouble. Source: Internet