a personal scale used for measuring how wrong, horrible, twisted (essentially fucked up) a situation is.
by hahahaNSF September 1, 2009

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

N. An idiot, a person of low intelligence, an asshole, a complete jack ass and a total waste of humanity.
Anita, you are being a real fuck-o.
George W. Bush and his Republican cronies are nothing but dirty fuck-os.
George W. Bush and his Republican cronies are nothing but dirty fuck-os.
by ToddJustin June 11, 2006

ie: way to go fuck-o! i almost had the "we gotta go girl" drunk enough for me to take home the slut in that group of chicks
by nick stebo October 7, 2007

by BigdickMceeee October 30, 2018

by Urban jackass June 12, 2018
