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
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2
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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3
A stretch of time in the early morning, generally around 4 A.M. to 6 A.M., which is either unreasonably late or unreasonably early depending on the context. Used to emphasize how late one has stayed awake, or how early one must wake up.
"We were all up 'til ass o'clock in a call, I didn't get any sleep last night."

"Mark has to get up at ass o'clock to go to work."
by CaseJackal May 12, 2015
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