Elements of Hashing
Basically a hash consists of three main parts, none of which have anything to do with the marijuana or hashish:
The Run (aka Trail)
One or two hashers, called the hare(s), lay a trail. They mark their trail with chalk arrows, shredded paper, flour, or pieces of toilet paper hanging in the bush, depending on local tradition or terrain. They might pre-lay trail a day or a few hours before the hash, or they might lay the trail as "live hares," running ahead of the pack with only a short (15 minutes is typical) head start. At a given signal, the rest of the hash (the Harriers, Harriettes, hounds, or pack) set off in pursuit of the trail. The idea is to keep the pack somewhat together and this is achieved by setting false trails, cunning checks, and sneaky loops. The fitter front runners will often run twice as far as the more slothful members, yet still finish the run at the same time as the rest of the pack. The length and difficulty of the run depends on the hare and the terrain but will typically be between four and eight kilometers, or about 45 minutes to an hour of running with checks, false trails, and shortcutting.
The Circle (aka Religion)
At trail's end hashers gather to drink beer and observe religious ceremonies . . . which consist of drinking more beer, this time ritualistically. Circles may be led by the hash Grandmaster, the Religious Adviser, or by a committee of mismanagement. Traditions (and the degree of rowdiness) vary from hash to hash, but in general the Circle consists of awarding "Down-Downs" for misdemeanors real, imagined, or blatantly made up, and the recipients will most likely have been dobbed in by their fellow hashers. Visitors are always given a Visitors Down-Down as are Virgins (first-time hash runners) and anyone else who comes to the attention of the Circle. The Circle can last a couple of minutes or half the night depending on the level of religious fervor of the hash. With changing times drinking has lost some of its importance and most clubs now modify their ceremonies to cater to non-drinkers and those stupid enough to think that hashing can improve their health.
The On-On (aka On-On-On, On-Afters, or Après)
Some hashes suspend ceremonies for awhile to consume food provided by the hare(s). Other hashes, at the conclusion of the Circle, repair to a nearby restaurant or pub. This is the social part of the hash, and the party usually breaks up afterward. In some hashes, however, religion may continue during or after On-Ons, with the telling of jokes and singing of songs, and all members, visitors, and virgins should come armed with at least one joke or song lest they be called upon.
The above article written by Steve "Modess" Trinka and stolen from the Hunter HHH page