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1.
Mtz
Mtz Pronounced: Muts?

A person who is good at a single aspect of a something, but believes that they are good at all aspects.
Example 1:

Roach: Mtz you shit bastard, put the sniper down we are playing Shipment you dumb mother fucking inbred piece of shit.

Mtz: stfu roach i cnt yoos ne ova gnz am so skild lolz

Example 2:

Roach: You wanna go MKB after your wraith bands Mtz pal.

Mtz: STFU I GOIN LIFESTEAL ON CLINKZ LOLZ TOTLI WASTIN G'S HURR HURR HURR

Everyone else: Mtz, just plug it you dumb waste of spunk.
by Sportzguy1098182839 March 20, 2009
 
2.
MTZ
Pertaining to Martinez, CA in the Greater East Bay, which is eight miles away from Concord. This is slang that is indigenous to the younger generations that reside there. It shares the 925 Area Code. Also called 'M-Town' by some, though that category is largely associated to mean Modesto by Californians.
"Bro, I haven't been back to my hood for hella days now-"

"A'ight, so when's the next time you're coming back down to MTZ then?"
by The 925's Protector February 01, 2009
 
3.
acronym for the city of Martinez,CA in the East Bay. 925 represent what it do!
MTZ has the best pills in the Bay Area.
by cmeblazin January 26, 2009