An hour of sleep. Instead of saying "I got five hour's of sleep last night", you say "I got five z's last night."
Friend 1: Man, you look like shit, what's your deal?
Friend 2: Shut up, dude I only got five Z's last night.
Friend 2: Shut up, dude I only got five Z's last night.
Z by SleepFaster May 24, 2011
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