DNF adj. 1. did not finish, in course-based sporting events, such as boating, auto-racing, and horse-racing. 2. did not find, in geocaching. (source: Double-Tongued Dictionary)
Further reading
Asthenosphere, a geologist’s term for the molten layer beneath the earth’s crust, sparks a journey that stretches all the way from ancient Greece to the author of Uncle Tom’s Cabin. Plus: What the heck is a dogberg? It’s when...