What is an mlg pro

An MLG pro is someone that plays on on the PRO-Circuit Ladder or PCL or PCOQ which is a ladder on gamebattles.com that you pay 25 dollars to join most MLG pros play Halo or Call of Duty but there is also starcraft II and super smash bros brawl. Sometimes people with say "OMG IM MLG PRO" when they do something good in there game. There is lots of variations of what people mean when they say MLG pro such as some people think when they receive money from playing the game that they are PRO at it.