To sleep. I'm not sure of how many ways to use it though.
If you were sleeping you wouldn't be "z'ing."
The only way I know how, or have heard anyone use it is in the example.

a girl with a small flat ass and no friends who will never get laid and no tits and is as flat as a pancake

Initialism for "Do You Think"

An object or cage used for storing racoons, dead or alive. Can be made of glass.

A chrome extension that enables 1984 mode

Verb - to completely destroy or annihilate any object in sight. Only those with cannon-arms and a literal six-pack (of beer) are able to perform this action, while those who receive this action are considered "tackle dummies" or "enemies of mankind."