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3.
z3
A radio transmission in Counter-Strike, meaning:

Stick together team,

but said in normal life
z3, z3!!! wtf?
by Lorne Richardson July 06, 2003
 
1.
z3
coolest bmw sports car
by Anonymous September 23, 2003
 
2.
Z3
standard government approved unit of measurement used to quantify the degree of extension of an object that cannot be aptly measured in the field.
"the value of Z3 is in fact only an estimate, as even our bravest researchers cannot be persuaded to make a firsthand measurement"
by Andrea November 10, 2004
 
4.
z3
Z3, An extension of a mans penis, the bigger the car the smaller the penis, driven by wall st brokers and theives
Hey baby wanna go for a ride in my Z3,
Lady: Fuckoff and get a bigger Cock.

Ay Ay Ay, theres a Z3 in that Garden lets nick it!!
by John (Phantom) August 31, 2006
 
5.
z3
Lamest BMW Sports coupe. Miata with a new badge. suXors.
"yo did your mom get a new Z3?"
"of course not."
by sparka July 13, 2005