fifty o' clock 

"Too late" or "very late"

I'll go shopping with you Dena, but I don't want to be out until fifty o'clock!

Yeah, Brad and I finally hooked up on Saturday night -- but he didn't call me until fifty o'clock!

fifty o' clock by Annie's Okay June 15, 2005

Fifty O'clock 

when shit happens, mostly good

hey nigga pass me that bottle you i'm looking for that fifty o'clock

Fifty O'clock by justin crudup January 8, 2008