Top definition
A gang name, short for Mara Salvatrucha 13.
Spreading from El Salvador to L.A. and across the United States, Mara Salvatrucha 13 is increasingly well organized and deadly.
by Info1131 March 30, 2005
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2
1: M13 is short for Mara Salvatrucha. Many people consider this gang to be the most dangerous gang in the world. It is well known for its extensively violent crimes upon the innocent. The gang first started in El Salvador but has spread to states in the US.

2:M13 - The Hercules Globular Cluster... a cluster of stars in space
1: "Dude I ran into some guy who had 'M13' tatooed on his neck... he said he was gonna kill me"

"Holy shit man, M13 is short for Mara Salvatrucha. You gon die."

2: "Wow man, M13 is such an awesome collection of stars".
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