We found one dictionary that defines the word stack z's:

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1. stack z's: Wiktionary

Definitions from Wiktionary (stack z's) ▸ verb:  (slang) To sleep; to be asleep. ▸ Words similar to stack z's ▸ Usage examples for stack z's ▸ Idioms related to stack z's ▸ Wikipedia articles (New!) ▸ Words that often appear near stack z's ▸ Rhymes of stack z's ▸ Invented words related to stack z's