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1.
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
69 19

Words related to ass o'clock:

butt o'clock exhaustion late night lotr marathon time
 
2.
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
25 11