one who joins an xbox live team based game for the sole purpose of screwing it up. full of annoying, repetitive conversation or loud c(rap)music. usually a friend of someone on the other team sent to give info to them or sabatoge by team killing, taking all the weapons on a map, stealing vehicles and ditches them for the enemy, destroying team assets, texting or voice chatting with the other team giving them teammates positions or plans, intentionally dying for the other team to get the win. a childish gamer. anyway you slice it acts like a leeroy jenkins.
"our team suffered a loss. thanks to an xbox leeroy"
"xbox leeroy, you getz tk'd this time. we rollz without you"
"omg, kick this xbox leeroy!"