Acronyms, abbreviations, and insiderisms

AI: Auction Interference. When someone takes out board anger by maliciously buying from a poster, or sends email to other buyers.
B&M: Brick & Mortar. A real, physical store as compared to online selling.
BBL: Blocked Bidder List. A list of ids which cannot bid on a seller's auctions.
BIN: Buy It Now
BO: Best Offer, optionally offered with any BIN
bump: Original Postings age off over time. If someone posts a reply, they come back to the front. Known as a bump.
CS: Customer Service at ebay
CSR: Customer Service Representative at ebay
cye: Check (or see) Your Email (poster has sent private email to the other poster).
DC: Delivery Confirmation. Required by Paypal seller protection.
DSR: Detailed Seller Rating. The stars.
EB: Empty Box. The board software allows posters to see other postings of specified posters as empty boxes rather than seeing the content.
fb: feedback
FRB: Flat Rate Box, three sizes available from USPS
FRE: Flat Rate Envelope, from USPS
FVF: Final Value Fee
GWP: Gift With Purchase (Marked "Not For Resale", but legal to sell on ebay)
INAD: Item Not As Described (same as SNAD).
INR: Item Not Received, a dispute buyer files with ebay
IPR: Immediate Payment Required. Optional with BIN, works like regular online purchase. Bidder has to pay before it is considered bought.
KWS: KeyWord spamming. Using a brand name in the title which does not describe the item being sold.
LPU: Local Pick Up (in contrast to shipping)
NARU: Not A Registered User. Usually a user who has been kicked off by ebay.
neg: negative feedback, or the act of posting negative feedback
NFB: Negative FeedBack
NPB: Non Paying Bidder
NPS: Non Performing Seller. Any seller who declines/refuses to ship what was sold.
NWOT: New WithOut Tags
NWT: New With Tags
OP: original posting, or original poster, the poster who started a thread.
OTP: Other Than Positive fb
pink: An ebay employee who posts to one of the discussion boards. The posting has a pink header.
pink slap: When a board moderator removes a posting for some violation.
PITA: Pain In The Ass
poof: what happens to a posting or thread which is removed by a moderator
posting ID: an ebay id used for posting, but not other activity. With fewer than 10 fb, limited to 10 posts per day.
PP: PayPal
RC: Resolution Center, for submitting disputes and complaints
restricted: unable to list new items for sale, usually due to bad feedback. Contrast to suspended.
RL: Real Life. As in causing someone real life pain because you don't like their posting.
RLI: Real Life Interference.
SC: Seller Central, a different Ebay board to discuss such issues.
SCO: Second Chance Offer, for when 1st place bidder flakes out, or seller has more than 1 to sell
SDC: Signature Delivery Confirmation. Required by paypal seller protection for items > $250.
SNAD: Significantly Not As Described. A dispute buyer files with ebay, and also a claim made by buyer in some communication with seller.
snipe(1): to post on a 100 boundary, such as the 100th reply in a thread. 1000 boundaries are particularly sought after.
snipe(2): to post the first reply, usually to a question, but also to some threads.
sock: A posting id operated by a regular poster, usually intended to be disruptive, sometimes to get around a suspension of posting privilege, and often for both. Recognized by very low feedback.
SR: Self Report. You can't edit a prior posting, but you can get it removed by reporting it as its author.
star: A detailed seller rating. 1 to 5 stars.
STR: Sell Through Rate. Sales/listings.
suspended(1): totally barred from any Ebay activity. NARU. Contrast to restricted.
suspended(2): Board posting privileges are revoked for some period.
troll(1): an insincere posting or poster, sometimes for fun, sometimes with malice (from the bridge troll)
troll(2): a posting intended to attract strong reaction (from the fishing troll)
UA: UnAuthorized use of a credit card, one of the things seller protection protects against
UPI: UnPaid Item (a dispute seller files with ebay)
vacation: the period when a poster (or less likely a seller) is barred from posting to the board (or selling).
VERO: Verified Rights Owner. The ebay mechanism which allows formal reporting of counterfeits by the rights owner, resulting in the listing being removed.
zero: a poster with all of zero (or private fb), and low number of board postings. Confirmed by new id icon, a shiny kind of person.