A footbag is a small, round bag usually filled with plastic pellets or sand, which is kicked into the air as part of a competitive game or as a display of dexterity. "Hacky Sack" is the name of a brand of footbag popular in the 1970s, which has since become a generic trademark.

What is hacky sack slang for?

Meaning of Hacky Sack in English

a brand name for a small soft ball that is often kicked in the air in games: The two teenagers were kicking around a Hacky Sack in the school parking lot. Footbag is the cool name for keeping a hacky sack in the air. [ U ]

Is hacky sack still a thing?

Dead as it may seem, hacky sack lives on as a small but active niche sport. ... Footbag pros play skilled solo competitions called “freestyle” and a team sport called “footbag net.”