Can you remember way, way back in time, when you were a gecoaching newbie? Deciphering those acronyms, of which there are many, could be compared to solving a puzzle cache. The following list, though not all-inclusive, is a glossary of some of the most commonly used abbreviations used in geocaching. Some are considered "official", while others have been coined by the cachers who have forever changed the language of geocaching.

The following list, though not all-inclusive, is a glossary of some of the most commonly used abbreviations used in geocaching. CITO: Cache In, Trash Out
FTF: First to Find (or STF, Second to Find)
MEFF: Most Esteemed First Finder (used more in certain areas than others)
RASH: Recreational Activity/Sport/Hobby
DNF: Did Not Find
GPSr: Global Positioning Satellite Receiver
SBA: Should Be Archived; cache is placed in a dangerous or prohibited location, is missing, etc.
TFTC Thanks for the Cache
TFTH: Thanks for the Hunt
TNLN: Took Nothing, Left Nothing
TNLNSL: Took Nothing, Left Nothing, Signed Log
WG$: Where's George dollar bill, often left in caches
DPM: des palourdes mortes; taken from a French phrase. Translated, it means "The long sobs of the dead clams wound my heart with a monotonous languor as they dance at midnight". In other words, it denotes a cache of poor quality.
PI or PO: Poison Ivy, Poison Oak
BYOP: Bring Your Own Pen (or pencil). Used in micro caches, for the most part, where there is no room for a writing implement.
TPTB: The Powers That Be, referring to the GC.com administration
TB: Travel Bug
YJTB: Yellow Jeep Travel Bug
GZ: Ground Zero; where the coords displayed on your GPSr match closely those of the listed coords for the cache
UPS: Alternately, UPR or URP; an unnatural pile of sticks or rocks that is often a telltale sign that a cache is hidden underneath such a formation
SWAG: Stuff We All Get, or treasure/trinkets left in or taken from a cache SIG: Abbreviation for signature, or signature item, that may be left in a cache to personalize a geocacher's visit
FRS: Family Radio Service, the system used by long-distance walkie-talkies
TOPO: Topography, or topographical map that displays the altitude of an area
WAAS: Wide Area Augmentation System; typically, a more accurate system of zeroing in on a set of coordinates, using a network of 25 ground reference stations that detect and correct errors in signals received by satellites
WP (or WPT): Waypoint
D/T: Difficulty/Terrain
LOC: Limited file format; it doesn't include details specific to a cache such as descriptions, hints, or difficulty and terrain ratings
GPX: File format that contains data that is lacking in an LOC file
PDA: Personal Digital Assistant, such as a Palm Pilot, Pocket PC, et al.
PQ: Pocket Query (a downloadable file in .gpx format listing waypoints, descriptions, and encryped hints, used commonly for paperless caching with a PDA
GTHOT: Got the hell outta there (an action taken by some cachers usually caused by the proximity of creepy crawlers or questionable individuals nearby)

There are countless other personalized acronyms used on an individual basis, such as logs with cryptic reports of ILHWMCPFFFIAMP (I laughed hysterically when my caching partner fell face-first into a mud puddle). Much like LOL and BRB have become commonplace terms in today's world, it seems cache-speak is here to stay.