Initialism. When applied to a "rocket-propelled grenade" it derives from Russian РПГ (RPG), initialism of ручной противотанковый гранатомёт (ručnoj protivotankovyj granatomjót, “hand-held anti-tank grenade launcher”), of which "rocket-propelled grenade" is a backronym (though an accurate description of the weapon system).

RPG

1. (computing) Initialism of Report Program Generator.

RPG (plural RPGs)

1. (games) Initialism of roleplaying game.
   • 1993 April, “Dragon Ball Z”, in GameFan, page 89:

     This is an RPG experience DBZ fans must have, but even if you've never seen DBZ, it's still an interesting game due to the unique fighting scenes and the ability to fly around the map.

   • 2009, The Official Xbox Magazine - Issues 92-95, page 335:

     I love shooters, RPGs, and pretty much anything with free-roam or gore.

   • 2021 January 4, Cian Maher, “Runescape^[sic] Is 20 Years Old Today - Here's How I Started A Pyramid Scheme When I Was Nine”, in TheGamer‎^[1], archived from the original on 2022-06-19:

     I reckon Runescape^[sic] is the game that introduced my young, ignorant, and stubborn self to modern RPGs. In a way, I owe at least part of how my career has shaped up to trimmed rune and obby capes.

   • 2023 August 28, Brad Norton, “Sea of Stars – Wheels minigame guide: How to play, best Heroes, more”, in Dexerto‎^[2]:

     Through many of the most iconic RPGs of our time, we’ve seen a range of popular minigames come into focus.

   • 2025 June 2, Michael Gwilliam, “89-year-old Skyrim Grandma switches to another RPG after 9 years”, in Dexerto‎^[3]:

     Viral YouTuber and grandmother Shirley Curry, better known as ‘Skyrim Grandma’ is finally playing another Bethesda RPG after nine years.

2. (weaponry) Initialism of rocket-propelled grenade.
3. (basketball) Initialism of rebound per game.
4. (education) Initialism of research postgraduate.

• (games): RPGer, ARPG, CRPG, JRPG, MMORPG, SRPG, tactical RPG, tactics RPG, TRPG, TTRPG, WRPG

• (gaming): LARP

RPG (third-person singular simple present RPGs, present participle RPGing or RPG-ing or RPG'ing, simple past and past participle RPGed or RPG'ed or RPG'd)

1. (intransitive, gaming) To play a roleplaying game.
   • 2016, David Liss, chapter 2, in Randoms, Simon & Schuster Books for Young Readers, page 9:

     When I got to my new school, it didn’t take me too long to find a group to hang out with. We RPGed, talked books, movies, and comics. We played video games, both in person and in co-op.

   • 2016, Teri Litorco, The Civilized Guide to Tabletop Gaming: Rules Every Gamer Must Live By, Adams Media, page 145:

     When you start RPGing, you describe an action your character is taking. Sometimes your DM will interject, asking you to make a test for success (typically a dice roll).

   • 2020 February, Mercedes Lackey, Cody Martin, Breaking Silence‎^[4], Baen Books:

     None of them really wanted to game without Beth. For one, it didn’t seem fair, and for another, the facts that she had a great imagination and really no concept of how RPGing was “supposed” to work meant she sprang stuff on the group that had livened up the games no end.

2. (transitive, weaponry) To attack with a rocket-propelled grenade.
   • 1981 November, B.P., “U.S. Embassy”, in Soldier of Fortune, volume 6, number 11, page 53:

     However, one group of Americans at the Embassy doesn’t creep around quivering in anxiety about being RPGed or machinegunned.

   • 2006 September, Robert D. Kaplan, Imperial Grunts:  […], Vintage Books, page 317:

     It was like the movie Black Hawk Down without the rioters. I was RPGed so often I gradually stopped ducking.

   • 2009, Ed Macy, Hellfire, HarperPress, page 343:

     The Taliban had buried a triple mine in the road a week ago and remotely detonated it under a Spartan. Then they RPGed the Scimitar trapped ahead of it.

• GPR, GRP, Grp., PRG, grp

From English.

RPG m (invariable)

1. (gaming) RPG; role-playing game

From English RPG.

• IPA^(key): [a̠ːɾɯ̟pʲiːʑiː]

R(アール)P(ピー)G(ジー) • (ārupījī) 

1. Abbreviation of ロールプレイングゲーム (rōru-pureingu gēmu, “role-playing game”).

Polish Wikipedia has an article on:

RPG

Wikipedia ^pl

Orthographic borrowing from English RPG.

• IPA^(key): /ɛr.pɛˈɡjɛ/, /ar.piˈd͡ʐi/
• Rhymes: -ɛ, -i
• Syllabification: R‧P‧G

RPG n (indeclinable)

1. roleplaying game, RPG (type of game where one or more players assume the roles of characters (usually one each) to interact with a fictional world either defined by themselves or through the moderation of a neutral judge (usually referred to as the game master))

   Synonyms: erpeg, gra fabularna

2. roleplaying game, RPG (type of computer game where the player takes the role of a character or party, normally lacking tests of physical skill and including more story-telling and narrative aspects than traditional action games)

   Synonyms: erpeg, gra fabularna

• RPG in Polish dictionaries at PWN

RPG m (plural RPGs)

1. (games) roleplaying game (type of game in which the players assume the role of a character)