The 'Admin, He's Doing It Sideways' meme originates from the legendary Counter-Strike: Source frag movie 'phoon - too zreals for zblock,' uploaded in 2010. The video showcases a player named phoon utilizing perfect bunny hopping techniques to move at impossible speeds, baffling opponents who accused him of cheating. The specific phrase is a quote from a frustrated player in the in-game chat who couldn't track phoon's erratic, sideways movement. Over the years, the meme has evolved into a tribute to high-skill gaming, unexpected speed, or anything that seems to defy the 'physics' of a situation. It is widely used in gaming communities to celebrate impressive movement or to joke about players who are simply too good to be true.