XIII is 13 in roman numerals, M is the 13th letter in the alphabet which represents Mexico or the Mexican Mafia also known as La "EME"
Sur XIII
by Brown huero December 30, 2003
The first Cel shaded first person shooter from Ubi soft.....its not bad
Yo download XIII demo if ya dont believe me
by Anonymous August 17, 2003
Gang identifier. See XIV
by Zapata August 19, 2003

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