Town of Salem relies heavily on communication between players. Since the Day and Night phases of the game are fairly short, and a lot of evidence may need to be discussed in these short spans of time, abbreviations and acronyms can be quite helpful. Here is a list of common abbreviations and their meanings. This list is only a small summary of all possible variations; many others can and will be used.
Reveal or Die - When a player is suspected of being either an evil role said player will be put on trial. If they do not reveal themselves, the said player will be lynched. This is commonly used when they claimed to be a Mayor, as Mayors can reveal themselves and therefore confirm themselves to the Town by pressing "Reveal".
Vig shoot player - Asking a Vigilante to shoot someone. Mainly used if an assumed evil is almost lynched, but sometimes used by Vigilantes to signal who they’re going to shoot.
Vote to Confirm - When a Mayor votes to confirm that they have not been bitten by a Vampire. However, this could get an innocent Townie put on the stand if the voting requirement is low enough.
Another less risky variation on this is that a player attempts to whisper to the Mayor, as a true revealed Mayor cannot send or receive whispers.
Voting and canceling your vote twice - This is the sign for being blackmailed. Note: This won't work for a revealed Mayor if 3 or fewer votes are required to put someone on trial, as a Mayor's vote counts as 3 votes, and it may lead other Townies to actually lynch said player. Members of the Mafia can also use this to a certain player to indicate that the player needs to be acted upon by a member of the Mafia, but this is rarely used.
1 for 1 / 1f1 - Lynching one player, and dealing with another based on their role, e.g. if a Sheriff accuses someone of being suspicious, so one of the two is lynched, with the understanding that if the target is suspicious, the Sheriff is confirmed, and if the target is innocent, the Sheriff is guilty, and vice versa.
#v# / # v # - Refers to the number of players left alive in each faction. A "4 v 4" would be 4 evils versus 4 Townies. Typically, numbers are named at the point where evil roles equal Town roles and it is thus safer for evil roles not to vote.
CC - Counterclaim. This is used when one player claims a role, but another player claims to have the same role (or another role of the same alignment).
D# - Day# - Analogous to N#; rarely used as most events happen at Night, usually only the Mayor uses this, but it's also rare for that to happen. Extremely common in reports. (Example: I said I am the Sheriff since D2 (Day 2).)
TR - Trial Rating. Relates to the number of reports a person has voted correctly on in the Trial System.
TT - Town Traitor. Used exclusively in the Town Traitor (Classic/Coven) game mode of the same name where one Townie is on the side of the Mafia/Coven. Can refer to the Traitor themselves or the game mode itself depending on the context.
GL - Good Luck (amicable thing to say at the start of a game).
GLHF - Good Luck, Have Fun (amicable thing to say at the start of a game).
HF - Have Fun (amicable thing to say at the start of a game).
IDC - I don't care.
IDK - I don't know.
IG - "I guess" or "In-game" depending on the context.
IGN - In-game name.
IMO - In my opinion.
inb4 - In Before. Used to essentially say something before anyone else, or make an outlandish/unlikely prediction. For example, after lynching someone that gives Mafia majority in Ranked with a dead Vigilante, someone could say "inb4 RandomTownVeteran."
Meta - Most Effective Team Available. The metagame, or the current top strategies. Used when discussing tactics players may use, for example, "You know, claiming to be an Executioner is the new Godfather meta." Often times used sarcastically or in a joking way.
MVP - Most Valuable Player. (Usually, a compliment given to the player who was the most beneficial to their team).
OP - Overpowered (Too strong). Opposite of UP.
PM - Private Message (Also known as a whisper). Not to be confused with the Potion Master abbreviation.
POG - Play of the game; used when a player exhibits extreme skill.
RNG - Random Number Generator. This mostly refers to game mechanics involving randomness, such as Psychic results.
TBH - To Be Honest (Normally used when defending on trial or building up an accusation early in the morning. Example: "TBH, there's got be 2 members of the Mafia left, and Giles Corey has to be one of them.")
Theme - Usually said before the game starts in the Lobby, and typically has a reference or popular trend before it, such as "Superhero" or "Food." This means a player wants to have the other players choose a name that would be related to the theme.
Tldr / Tl;dr - Too Long; Didn't Read (sometimes used when a LastWill is too long, and the player doesn't want to read it).
TY / Thx - Thank You (usually said after one player has been helped by someone else, for example, "TY Doctor for healing me", or "Thx for voting inno on me").
UP - Underpowered (Not strong enough). Opposite of OP.
WB - Welcome Back.
WIP - Work In Progress.
Res / Rev / Ret / Rez - Resurrect/Revive (Retributionist no longer brings someone back to life)