DPS, HPS, TPS
"DPS," "HPS" and "TPS" respectively stand for "damage per second," "healing per second" and "threat per second." They are often used as metrics to judge the performance of the three different roles in group settings, damage dealers, healers and tanks. For example, a player might say, "You will have to do more DPS than that to kill the boss," "that healer is horrible, his HPS is really low" or "if the tank doesn't start doing more TPS the boss is going to kill me." "DPS" is also used to indicate characters who perform the damage-dealing role. For example, a player might advertise "looking for one DPS for Baradin Hold, last spot."
LFG, LFM, PUG
"LFG" stands for "looking for group" and is used by players to advertise they would like to be invited to a group for a specific dungeon or raid; similarly, "LFM" stands for "looking for members" or "looking for more," advertising that a group is being formed and still has some available spots. "PUG" stands for "pick up group" and defines any group that is composed of players who have never before played together, as opposed to a group composed of friends or members of a guild who play together frequently.
MS, OS, RR
You will often see the acronyms "MM," "OS" and "RR" used when discussing item drops or loot rules. For example, a player might ask, "Could I get that for my OS?" or state that "loot rules are MS priority over OS, things nobody needs will be disenchanted and I will RR the crystals." "MS" and "OS" respectively stand for "main spec" and "off spec," referring to each player's primary and secondary role. "RR" stands for "raid roll," a type of item distribution in which the leader of the group performs a single roll based on the amount of players in the group and assigns the item based on the result. For example, in a 10-player raid group, the group leader would roll a number between one and 10.
AOE, DOT, HOT
"AOE," "DOT" and "HOT" are acronyms used to identify specific types of spells. "Area of effect" spells, "AOE" for short, are spells that damage all enemies in a specific radius rather than just one. "Damage over time" spells, "DOT" for short, are spells that deal their damage slowly over time rather than all at the same time; similarly, "heal over time" spells, "HOT" for short, are spells that heal a certain amount of damage every few seconds rather than do all the healing upfront.
BOP, BOE, BOA
These acronyms refer to three different type of items. Items that are "BOP," or "bind on pickup," can't be traded to other players once acquired, while items that are "BOE," or "bind on equip," can be freely traded until a character equips them, at which point they can no longer be traded. Lastly, items that are "bind on account," "BOA" for short, can be sent between characters on the same "World of Warcraft" account but may not be traded to other players.
CC, LOS, OOM
A player who asks you to "CC" something is using the acronym to indicate "crowd control," a type of spell that will remove an enemy from a battle for a short amount of time. Examples of crowd control spells are a mage's Polymorph, a shaman's Hex, a hunter's Freezing Trap or a warlock's Banish. "LOS" stands for "line of sight." Most spells and abilities may not be cast if the target is out of line of sight. For example, a player might say, "I couldn't heal you, you moved out of my LOS." "OOM" stands for "out of mana." Players of classes that rely on mana to cast their spells and abilities, such as priests and paladins, may call out they are "OOM" to inform the rest of the group they should pause for a short while before proceeding.
WTB, WTS, PST, COD, LFW
These acronyms are frequently used by players in the trade channel, a chat channel visible only in capital cities and dedicated to the buying and selling of items and services. "WTB" stands for "want to buy," while "WTS" stands for "want to sell"; both are typically followed by the names of one or more items the player wants to purchase or sell. "PST" stands for "please send tell" and is often added at the end of messages to invite other players to get in touch. "COD" stands for "cash on delivery," the ability to mail an item to another player and have him pay a specified amount of gold before he is able to take the item. Lastly, "LFW" stands for "looking for work," frequently used by players who are advertising their professions and looking for potential buyers of their services.
Dungeon Acronyms
The names of dungeons and raids in "World of Warcraft" are frequently quite long. Because of this, players often shorten them into acronyms when chatting about them. For example, "BoT" stands for "Bastion of Twilight," while "LCoT" stands for "Lost City of the Tol'vir." You can easily understand these acronyms by considering the level of the player who is using them and thinking about dungeons and raids available at that level.