IGN has 2 meanings
What's your IGN so I can add you as a friend?
|MMO||Massively multiplayer online|
|MMOG||Massively Multiplayer Online Game|
|MMORPG||Massively multiplayer online role-playing game|
|PVP||Player versus player|
|ARTS||Action real-time strategy|
I've got nothing
An acronym utilized to say that you don't have a response or comeback to a question or comment; may also be used to tell a person that you literally don't have anything.
You have any ideas for the party?
A gamer's IGN is their "in-game name." IGNs are screen names or aliases that players use while playing online games, especially MMORPGs, MOBAs, and FPSes.
For example, while your friend Mike Jones may go by Mike IRL, in League of Legends (LoL) his IGN may be DeathBringer3001. Typically, a player's IGN is shown above their in-game character.