What is Hashing?
Short Answer: A Drinking Club With a Running Problem.
Long Answer: Hash is short for the Hash House Harriers. It is an international organization of runners, joggers, walkers, etc. that get together a regular basis to drink beer, socialize, then try to catch a Hasher on a trail that he/she has cleverly laid out with assorted symbols that may or may not be the actual way to go.
Confused? You won't be after this week's Hash on Trail. (Please Gispert let someone get that reference so I don't feel so old.)