"ArUn" is a word commonly used to define
people who refuse to learn proper grammar. They often have difficulties trying to properly communicate with other
people because of it. They often use "xD" at the beginning and end of every sentence. Such users are quite common in the Comments section of sites
like YouTube, Vimeo, Disqus etc.
Sarah: Whatevs
Bish xD am gonna go torrent that Free MMO now
xD
Jimmy: The English, You're killing it. You just went full ArUn.