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1.
z1
A radio transmission in Counter-Strike, meaning:

Cover me!

but said in normal life
z1, z1!!! wtf?
by Lorne Richardson July 06, 2003
 
2.
z1
Fast 70's motorcycle with an inline four that eats Harleys for breakfast.
Thats a badass Z1 you got there. What year is it?
by T- bag April 10, 2006
 
3.
Z1
Z+1(one)=Zone
IM way to say zone
Guy 1 writes: "i have to get in the z1 to go skydiving tmrw!"
Guy 2 writes: "w/e dude, ill stick to sk8ing"
Guy 1 writes: "bitch"
by ultra555 August 19, 2009