Top Definition
CB lingo for getting some sleep; frequently used by people that did drugs in the 70's and/or watch Smokey and the Bandit whenever it's on cable
John: "Hey man, what are you doing?"
Rick: "I'm getting ready to start stacking z's before I have to go out on a long haul tomorrow."

or

John: "I think it's time to hit the hay and stack some z's."
Ginger: "OK, I guess we won't have sex then."
by gor8drz April 07, 2010

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