The Sack Lexicon.

The first rule. No apologies for a bad kick. The bag is dropped, the round resets, and the circle continues. To say sorry is to admit the circle exists for your benefit rather than the game's. It does not.

The closing call. Used to end a session, mark a clean save, or affirm the circle. Not a chant. A punctuation mark.

Dissing the game or the circle. The most serious infraction in the lexicon. Sackrilege is rarely formal — it is mostly noticed and remembered.

The initial toss of the bag, traditionally to the chest. Sets the rally. A clean serve is its own small art.

When the bag hits the ground. Round over. No commentary required.

The end of a round. Distinct from a Drop in that a Dead Sack acknowledges the round is over and the next serve is queued. The bag is dead, long live the bag.

A rally that runs so long no one knows the score. The platonic ideal of a circle. Schools where Hackfinities happen daily are usually ranked top 10.

The person trying to get everyone to join the circle. Recruiter, organizer, evangelist. Every great team has one.

A player who talks while holding the serve. Disruptive at best, sackrilegious at worst. The serve is for serving.

Someone who constantly asks for rides to play. Affectionate term, not necessarily an insult — but the rides add up.

A player who drifts too far from the circle and can't pass the bag back. The bag belongs to the circle, not to the individual. The Hog forgets this.

Knocking the bag to the ground with your knee. A specific, recognizable failure. Worse than a normal drop because the knee is a failure of intention, not technique.

A high-flying kick that sends the bag far outside the circle. Sometimes celebrated for height. Always followed by a long walk.

When the bag drops in the dead center of the circle and no one moves for it. A collective indictment. The circle, in that moment, has failed itself.

Catching and balancing the bag on a body part — usually the foot, knee, or chest — without it touching the ground. The base unit of trick play. Stall leaders are tracked at the state level.

A single contact with the bag. As in, "twelve hacks before the drop." The unit of measurement for a rally.

The fundamental unit. A group of players, usually three to six, kicking the bag among themselves. The circle is sacred. The circle is the point.

A player. The general term. Sackers run the circle.

A session. A gathering of sackers, scheduled or otherwise. Most often after school, in a parking lot, on a quad, or in a commons.

A recovery kick that keeps a doomed bag airborne. Saves are remembered. Saves win games.

A play surface where a player practices alone, kicking the bag against a wall. Where stall records are set. Where the great ones come from.