Do you ever come across a cryptic message in an item listing that looks something like this:  “OOAK ACEO WITH PURCHASE, BOGO!!” and promptly think to yourself:  “O-O-HOOPTIE-HOO-HA-A/C-WHAAAT?!”

Don't worry, you're not alone.  There's a whole Etsy-centric language out there that sometimes baffles the most die hard Etsy shoppers.  

Here are some definitions that will help you find what you are looking for:

ACEO/ATC: An acronym for a very specific form of collectible art. It stands for Art Cards Editions & Originals or Artist Trading Card, respectively.  Art cards are collected and traded worldwide. Collectors appreciate both one of a kind art cards, and limited and open edition art cards. An ACEO or ATC must be exactly  2.5x3.5 the size of a traditional baseball trading card, and can be in any medium an artist can think of — from crayons to glass to metal, anything at all.

Alchemy: An Etsy site feature that allows a buyer to request a specific custom item; sellers then bid on the opportunity to make it for the buyer. You can also do a private Alchemy request directly through a seller's shop (if they've opted in to taking such requests).

Amigurumi: The Japanese art of knitting or crocheting small stuffed animals and anthropomorphic creatures.

AOP: This stands for Artist's Own Pattern, meaning a store bought pattern was not used to create the item. Or AOP may refer to the pattern itself if the pattern is the item for sale).

BFSC: Built from Scratch Clothing.

BOGO: Buy one, get one. Thanks to Payless shoes, most people know this term, which is used in promotional sales.

Convo: Short for 'conversation', Etsy's messaging system.

Geekery: A top category on Etsy for kitschy, "nerdy", "techy" and gaming-related accessories.

Gocco: a small-format screen printing system.

HTF: Hard to find, maybe related to groovy vintage items or rare components. Or my car keys!

OSWOA: Original Small Work of Art, not to be confused with ACEO/ATC.

OOAK: One of a Kind. OOAK can apply to anything at all that will only be made by the artist one time.

PIF: Pay It Forward.  Items listed as PIF's on Etsy are usually $0.20 - $1 and by purchasing one of these items it's expected that you will, in turn, list your own PIF.

Pounce: A way to shop on Etsy. Find other items by a seller who just made a sale or items just listed by sellers who have yet to make any sales (undiscovered).

SRA: Self-Representing Artist.

SRAJD: Self-Representing Artist Jewelry Designer.

SNS: Saturday Night Special, weekly sale run in the Promotions section of the Etsy forums.

Time Machine & Time Machine 2: A way to shop on Etsy. The time machines list items that were just listed, will be expiring soon, or just sold.

Treasury: A list made up of favorites, created by one person, and lasting up to 3 days before it expires.
 
That should get you started!  For a complete Etsy glossary check out Etsywiki.com, a great place to get questions answered! Or do a search or post a new topic in the forums.