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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"
by Brown huero December 30, 2003
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2
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
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3
Gang identifier. See XIV
by Zapata August 19, 2003
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