Traditionally, LARPing is when a bunch of nerds get together in a field or pasture and beat each other up with foam core swords. In the internet sense, it refers to people who put on a façade and lie about having lives that are far more interesting than they really are.

Larping (or LARPing) is short for "Live Action Role-Playing". A live action role-playing game is a form of role-playing game where the participants physically act out their characters' actions. The players pursue their characters' goals within a fictional setting represented by the real world, while interacting with one another in character. The outcome of player actions may be mediated by game rules, or determined by consensus between players.

The first LARPs were run in the late 1970s, inspired by role-playing games and genre fiction. The activity gained international popularity during the 1980s, and has diversified into wide variety of styles. Play may be very game-like, or may be more concerned with dramatic or artistic expression. The fictional genres used vary greatly, from realistic modern or historical settings to fantastic or futuristic eras. Production values are sometimes minimal, but can involve elaborate venues and costumes. LARPs range in size from small private events lasting a few hours to huge public events with thousands of players lasting for several days.

Live Action Role Play

a type of game where a group of people wear costumes representing a character they create to participate in an agreed fantasy world. Uses foam sticks as swords, foam balls as magic and other props to create the games world.

Live Action Role Play. A LARPer is someone pretending to be something they're really not.

In the 70's and 80's LARPs were people dressing up like dungeons and dragons for Renaissance Fair. Since the dawn of YouTube and social media, LARPs are the new psyops. People LARP on YouTube as Truthers, Christians, Social Justice Warriors, and civilians.
govLARP = agents of the government pretending to be civilians. Crisis Actors = LARPers.
LARPwars = two or more LARPers in a social media pseudo-feud.

Legacies Role Play System

LaRPS is a roleplaying system in use for monitoring and advancing a players statistics throughtout their roleplaying session. Its prime use is in Second Life, OpenSim and other virtual worlds where avatars use storytelling as part of interactive scenes, which may include combat, in a virtual community environment.

copying or pretending to be something or someone

Used to just mean Live Action Role Playing, now it's also used figuratively and derogatorily in the context of online political discussion to describe people or activities involving absurd adherence to ideals, inflammatory messages, and elaborate outfits or accessories to deliver a sense of association with political groups often just for the social and visual experience of it all or due to a sanitized misunderstanding of activism in general born of the information age. Pairs good with gatekeeping.

A fancy name for playing pretend.

Someone who participates in LARPing, or Live Action Role Playing, in which people dress up as things normally children would dress up as for halloween (knights, elves etc) while swinging around foam swords to pretend-fight. Larps typically lack social skills and resort to larping to connect with others of similar IQ level