It is a person's name.
See, Zach? I wrote a definition. Stop saying "What does Zach mean?" now.
#1. A name of a person who is often smart, cunning, dresses well and likes to have fun. A party goer that attracts many people with his intellect, jokes, and good smile.
#2. A name of a person who likes to fool around and be with his friends, often very caring about others and has no problem dealing with tools.
My boy Zach likes to play beer pong at the college fraternity perties, he is the life of the party.
the coolest person in the world, next to God. revered as one of the best people to know by many scientists around the world. he is so cool that everyone wants to meet him and all the hot chick want to be near him.
zach z, the coolest person that ever has touched the face of the earth
These are just a few of my favorites

The list keeps going. search it yourself to find about 50 more similar to these. ^_^
*edit* An Immortal; One that is not easily defeated.
Don't act like you're Zach or something. Just found this one. I like it.