hacky sack
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See also: hackysack and Hacky-Sack
English[edit]
Etymology[edit]
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 footbag.
Noun[edit]
hacky sack (countable and uncountable, plural hacky sacks)