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4.
a Major league gamer. A MLG is a variation of a n00b, this species of n00b is very aggressive and is very unskilled. they have low self confidence and think that signing up on a website makes them a gaming god.

1- the subspecies of MLG

A. the squeaker- the kid who thinks he is pro and makes retarded noises .

B.the rage quitter- a MLG who is a sore loser and quits because he has the lowest score

C. Dr. Hax- the MLG who thinks he is so good that if he dies it most be hacks

D. the Captain- the dude that fails to much on his own and blames his teamates

E. the weapon-hugger- a MLG who thinks power weapon Kills are legit and will team kill to get it

MLG consist of spoiled kids, and lonely men that masturbate in there mother's basement. The only way to destroy a MLG is to use A ownage beam which happens constantly with MLG pros
XxProxX- hey noob give me the sniper rifle *team kill*

me- What the fuck you MLG pro prick

XxProxX- *tries to kill a guy, then dies* aahhh you use Hax you faggot

i took the sniper and got 5 kills he, he still team kills me and now has a score of -2
by who are you computer? October 24, 2010
 
1.
MLG stands for major league gaming. This is pretty cool. An MLG Pro, however, is someone who blows off playing Xbox Live with their real friends to play with other MLG Pros, who are all in the MLG, but they have no idea who they are in real life. They also take games way to seriously, and sap the fun out of playing with them. According to MLG Pros, "video games are not for fun. They are serious business". One way to counter an MLG Pro is to simply leave the game, or do stupid things to screw it up.
When I was playing Gears Of War 2 with my friend, who is an MLG Pro, he got mad when I said I had to go eat dinner and that I might do something else or play a different game afterwards. Then, when I decided to play with him again, he said no because he was playing with his other MLG Pro "friends".
by Shaolin Masta February 11, 2009
 
2.
Defining one's status or level at a game. MLG stands for Major Leauge Gaming, so it is a compliment. It is saying the person is really good at the game, or had a really cool moment.
Man 1: Did you see me get that kill?

Man 2: Yeah dude your so MLG pro


Dave: I totally own at this game!

John: You are so MLG pro!
by PalindromemordnilaP April 21, 2009
 
3.
A phrase constantly used in Minecraft YouTube parodies, where the creator is trying to sound cool but is actually ridiculously nerdy and pathetic.
*random emo music* like an MLG Pro ooooooh yeah!
by - Adlephix - April 14, 2014