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12.
MLG
It stands for Major League Gaming. AKA Major Loser Geeks. It's full of nerds with white pasty looking faces who sound like goats when they talk playing halo 2 with each other in order to get them aroused for their circle jerk. Some people actually consider it a sport. Well, if it IS a sport, then it is the only sport i ever heard of where the best players are the ones who are lazy fat asses who never get off the couch and can't get any girls. Completely ironic if i do say so myself. However, they do have very strong hands due to frequent masturbation and constant use of the fingers and thumbs to "pwn nubs".
xX n0 scizzop3 Xx: "OMG WTF MY NO SCOPE DIDN'T KILL YOU WTFFFFF!!!!!!!! fuckin bee ess!!!!!!!"

MLGJohn: "axxxxxshully, YOU MISSED ME CUSH U CAN'T NO SCOPE FOR SHIET CUZ U HAVE NO SKILL LOLOLOLOLOLOLOL! I play in MLG so therefore my penis is larger than yours and i have more skill at life."

xX n0 scizzop3 Xx: "YA WELL.....UR A FIAG! AND I DIDNT MISS CUZ I NEVER MISS CUZ MY NAME IS FWUCKING NO SCOPE SO OBVIOUSLY YOU HAVE HOST! YOU'RE GARBAGE! NO FUCKIN SKILL!!! MIIIHHHHH!!!"

MLGJohn: "AXXXXXXSHULLY EYEPWNU ANNNNND I GET PAID TO PLAY CUZ IM SPONSORED SON! OH AND I ACT OUT HOW I AM GONNA PLAY BEFORE I PLAY SO I CAN MAXIMIZE MY PWNAGE POTENTIAL!"

xX n0 scizzop3 Xx: "YA.....WELL.....UR GAY!!! GAYGAYGAYGAYGAY! *Presses B to leave to leave the post game lobby*"

every girl in the world "wow these kids are fuckin NERDS!"

by HALOF@G September 16, 2006
 
1.
MLG
An organization in the United States for professional gamers. Is an acronym for "Major League Gaming." Many great gamers have been professionally signed by MLG. As of now, they mainly focus on Halo 2 tournaments. They also post 'official' gametypes for Halo, Halo 2, and other games, so the gametype is fair and perfect. For example, an MLG game for Halo 2 Team Slayer would be battle rifle spawn, human weapons on map (no sword for fairness), etc. Many believe MLG is a lame gametype, though others practice it often in hopes of getting good at it. By the way, if you'd like to be funny, next time someone wants to play MLG over Halo 2 over XBL, ask them, "What's MLG? Does it stand for My Little Gun?"
Those MLG bastards! They won't let me play in the upcoming tournament for my city this weekend.
by Host3ntropy June 19, 2005
 
2.
mlg
Men Lacking Girlfriends, aka "pro" gamers
Lgerrious: "Damn, bill went 69-0 in team deathmatch."
Dshean: "He's mlg dont worry"
Bill: "SHUT UP! I ASKED A 4TH GRADER SHE SAID YES."
L+D: "dude you're a senior in college..."
by br0wnman November 10, 2010
 
3.
MLG
Stands for Major League Gaming and hosts events for competitive video gamers. By placing high at these events you are signed to be a professional gamer. It also is a matchmaking playlist in the video game Halo 3 with specific settings and gametypes.
XBL try hard: "Get raped you MLG cunt. Oh you're on the BAMF Ladies? Damn they are the hottest girl gamers! Marry me?"
by BAMF Beauty February 24, 2009
 
4.
MLG
1. Acronym for Major-League-Gaming, a videogaming organization that hosts pro circuts in a variety of games from shooters to fighter games.

2. Adjactive- to describe somthing as cool (usually in a sarcastic manner)

3. Someone who participates in MLG is often labled as a professional gamer or MLG (somtimes being sarcastic). Some of the more popular professional games are sponsered by companies.
1. guy1 "Hey, are you going to the MLG event this week in dallas"

guy2 "Hell ya, Ive been practicing my Zerg rushes all week"

2. "COLLATERAL NO-SCOPE, MAN IM MLG"

3. guy1 "wow whos that douche yelling over xbox live"

guy2 "Some mlg faggot"
by DatHydro April 26, 2011
 
5.
MLG
Acronym for Major League Gaming, a competitive gaming league. Known for hosting large tournaments in games such as League of Legends, Starcraft, Halo, and Call of Duty.

Also known for its very elitist community, both fans and players on the pro circuit. For example, with Halo 4, the MLG community was quick to abandon all the new features and abilities that Halo 4 offered, as they weren't "competitive" enough, and instead chose to use settings that were pretty much the same as those used in Halo 2 and Halo 3. MLG later dropped Halo from the pro circuit, partly due to Microsoft's deal with Virgin Gaming, and partly due to the settings being too different for the players to handle.

So, in short, these players live in the past and refuse to adapt to changes made in the games they play because that would mean learning new game mechanics, and that would just be the end of the world.
MLG Tryhard: Holy shit you guys suck I bet none of you can't beat me in a 1v1!

Average Player: Alright, let's do it. Infinity Slayer on any map.

MLG Tryhard: Ha no way dude. I'm MLG I only play BR starts since that's the most competitive bro. What a scrub!

Average Player: Says the guy who can only win using the "MLG" settings. If you're so good, then you should be able to win no matter what settings are being used.

MLG Tryhard: Man fuck off you're just a dumb casual! I'm gonna go find a Gamebattles match now since I don't have time to deal with noobs like you!
by iduncurr September 28, 2013
 
6.
MLG
A term used in the Gaming community and abbreviation for Major League Gaming but often used as a gamer who has a high level of talent.
Kid 1: Wow this kid just got 21-0 on search and destroy

Kid 2: Ha he is MLG
by isponge xp April 17, 2010
 
7.
Acronym for "My Life is Gaming";
a term profusely used by 10 year old Xbox players, to show how 'amazing' they are at a very short lived and degraded game. Not to be confused with MLG, which is a term reserved for actually skilled players.
You "I just got a 2 KD ratio on MW2! I'm gonna go M.L.G!"
Friend "Everyone plays Black Ops now..."

PC Gamer (Still on CS:S and TF2)
by Professional Gamer October 30, 2010