Green’s Dictionary of Slang

z n.1

also Z, zed, zee, z’s, zzz
[echoic of the sound of one’s breathing]

[1960s+] (orig. US) in pl., sleep in general; esp. in phrs. below.

In compounds

In phrases

bag Z’s (v.) (also bag zeds)

[1960s+] (US campus) to nap, to sleep.

blow Z’s (v.) (also hit some Z’s)

[1960s+] (US) to sleep; also to snore.

bust some Z’s (v.) (also cut (some) Z’s, cut (some) zulus, pick up some Z’s, pop..., snag...)

[1960s+] (US) to have a nap; to sleep.

catch a few Z’s (v.) (also catch some winks, catch some Z’s )

[1960s+] (US) to have a nap.

clock Z’s (v.)

[1990s+] (US black) to sleep.

cop some Z’s (v.) (also count Z’s)

[1960s+] (US) to sleep, to have a nap.

stack Zs (v.)

[1960s+] (US) to have a sleep, to nap.