by Harold Q Poppinjay January 21, 2011

The time of day, typically in restaurants or cafeterias, between food rushes when service is very shitty and there's very little food selection. May also be used to describe times of poor service in other areas.
by Bebhanub September 11, 2010

Hey Jack when are we leaving?
"At approximately ...fuck knows o' clock. Tomorrow."
What time is it?
"Fuck knows o' clock. Get a watch."
When did you fall asleep?
"Um, at fuck knows o' clock. I don't know!"
"At approximately ...fuck knows o' clock. Tomorrow."
What time is it?
"Fuck knows o' clock. Get a watch."
When did you fall asleep?
"Um, at fuck knows o' clock. I don't know!"
by HyperLynx September 22, 2016
