WTF O'Clock 

After working straight through the evening it is the hour when you realize that you've worked all the way through the night, and the sun is about to rise.

This most often happens with design, development or other types of work when it's easy to lose time while focused on the task at hand.

I really got in a zone working on the design comp for the new project. I started around 3p and worked until WTF o'clock.

WTF O'Clock by reroller April 2, 2009

WTFO’clock 

Any time between midnight and 5 am that a runner or asylum of runners chooses to start their morning long run.

Often associated with running before the birds chirp.

Geez man I’d love to join you this morning but I just can’t do WTFO’clock

WTFO’clock by Sugardaddy55 October 14, 2021