Several hours earlier than the crack of dawn. Specifically, when you have to get up really early in the morning. See also dark times.
My flight's at 6:00 am and I gotta be a the airport at the crack of crack tomorrow!
by KM March 10, 2004
If the crack-of-dawn is early, then the crack-of-the-crack-of-dawn is even earlier. Hence, crack-of-crack.
I gotta get up at the crack-of-crack tomorrow 'cause I'm driving to Bakersfield. No Chappelle show for me!
by DK March 11, 2004