The primary meaning of LFG is “looking for group,” which is an appeal for like-minded individuals to join together online. This usage is most commonly associated with online multiplayer games, particularly massive multiplayer online (MMO) games. However, the meaning has expanded to include other niches and online platforms such as Twitch, Facebook, and Twitter.
LFG is also used in non-gaming contexts. For example, someone looking for a plant-based diet group might post “just gone 100% plant-based, LFG” on Reddit or Twitter, hoping to receive suggestions for relevant online communities.