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See also: hackysack and Hacky-Sack


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A trademark of Wham-O. It uses reduplication of the word sack with the word hacky; a "hack", in the game's terminology, is akin to a point, and happens when every player in a group successfully passes the foot bag.


hacky sack (countable and uncountable, plural hacky sacks)

  1. (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.
  2. (countable) The foot bag used for such a game.