Ass o'Clock 

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."

Ass o'Clock by CaseJackal May 12, 2015

ass o'clock 

An unreasonably early hour.

I gotta get up at ass o'clock every day for the next month. I hate my job.

ass o'clock by LudwigVan October 1, 2004

ass o'clock 

A time very late at night or very early in the morning when most people are or ought to be asleep.

My sleep schedule is ruined because my favorite YouTuber uploads at ass o'clock

ass o'clock by the riverside November 3, 2023

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.

ass o' clock by Hypermodern September 5, 2006

eat my ass o’clock

when it’s time for someone to eat my ass

oh look it’s eat my ass o’clock

eat my ass o’clock by Angelcormier March 9, 2019