They are a series of remix videos parodying the “video game montage” subgenre on YouTube, which is characterized by quick-paced edits and looped footage, as well as heavy use of loud dubstep music and squeakersounds in the background. The first MLG montages came around 2009, where YTP was reaching its peak.
Major League Gaming was first founded in 2002. MLG parodies are similar videos to YouTube Poop.