To be reported by the other nine players in a game of five-versus-five, for example in League of Legends. In order for an x9 to occur, a request has to be made in All chat.
by Bowsette_IRL June 21, 2016
 Get the X9mug.
Get the X9mug. Hey bro did you say that joão got X9'ed by paulo, and now he is on prison?
Yeah man let's get his ass! X9 dies early!
Yeah man let's get his ass! X9 dies early!
by Aquele cara ali January 7, 2018
 Get the X9mug.
Get the X9mug. Gang originating in the Northeast portion of the United States of America. Their colors are black and green.  Can often be seen owning up.
by __-_ January 14, 2004
 Get the X9mug.
Get the X9mug. It's a Brazilian slang to define someone who is a whistleblower. It stems from American comic books, initially published in newspaper strips in 1934.
by big.mc August 28, 2019
 Get the [x9]mug.
Get the [x9]mug.