Top Definition
An unreasonably early hour.
I gotta get up at ass o'clock every day for the next month. I hate my job.
by LudwigVan October 01, 2004
1 more definition
5 Words related to ass o'clock
Really, really f-ing early.
Dude, I had to be up and out of there at ass o' clock in the morning.
by Hypermodern September 04, 2006

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