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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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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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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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt