The true usage of the phrase is to claim that you simply 'do not know', however, the phrase is often interpreted as 'Fuck Nose' which may cause offence to the listner. This mis-interpretation is often replied to using 'Cunt Face' which is regarded as the appropriate answer.

"What time is Adam supposed be be here?
"Fuck Knows"
"Only asking...Cunt Face"

Fuck Knows by Mystick Havok January 21, 2008

fuck knows when

To exclaim that you don't know when an incident will happen.

Wife: When are you comming home?
Husband: Well I've got all this paperwork to do. I won't be back till fuck knows when.

Neighbour: Oh, you're looking for Steve? He's gone on holiday, won't be back until fuck knows when.

fuck knows when by Tom_NZ May 14, 2007

Fuck Knows o' Clock

An unknown time of day. Can be past, present or future.

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!"

Fuck Knows o' Clock by HyperLynx September 22, 2016

nobody knows shit about fuck

Essentially means noone knows what's going to happen.
Derived from a quote from the Netflix series Ozark
It has become widely used in the cryptocurrency sphere as a phrase to remind people you can't know if the market will go up or down.

Redditor 1: Did you guys buy the dip? I bought LRC and CRO
Redditor 2: This is not a dip, this is the beginning of bear market
Redditor 3: Nobody knows shit about fuck.

nobody knows shit about fuck by xd_baTron January 9, 2022

Fuck Your Couch With a Passionate Love That Knows No Bounds

1. "To boldly state that one has no outward care for something that does not immediately make sense."

2."To state that another must have intercourse with their own couch whilst greatly enjoying it."

3."To not give a fuck."

"Hey Bob, did you hear about-"

"You Know what, Fuck your couch with a passionate love that knows no bounds."

"Huh?"

Fuck Your Couch With a Passionate Love That Knows No Bounds by Bueriahn September 5, 2012

A man who knows how to fuck

Arnesto Da Costa

Arnesto Da Costa, a man who knows how to fuck

A man who knows how to fuck by Oseudop168 April 25, 2023

Galantir

A group of people, typically women, searching through someone’s digital footprint in order to find more information about that person.

Susie wasn’t sure if her new Hinge match was a creep, so she assembled Galantir and they found out he used to post slurs on gaming forums.

Galantir by Ge-sus September 22, 2026

Word of the Day on September 23, 2026

murderhobo

In a tabletop game, a murderhobo is a player who murders NPCs indiscriminately. This is normally derogatory, referring to a player who totally ignores quests, dialog, backstory, trade, world building etc.

The term is most common with Dungeons and Dragons, but it can be applied to most RPGs where the player is allowed to kill most quest-giving NPCs and NPC traders. E.g. Elder Scrolls, Fallout, Divinity original sin.

DM: The sad little orphan girl tugs at Steve's trenchcoat to get his attention, and ask for help saving her pet dog from...
Steve: I'd like to roll a strength check against strangling the orphan.
Dave: I call dibs on the dog.
DM: You murderhobos disgust me.

murderhobo by Loup&S September 9, 2021

Word of the Day on September 22, 2026

Whale

In sales terms, a whale is a prospect that is significantly larger than an organization’s average customer.

Whales are large and extremely difficult to close. Due to their immense size, they are highly sought-after.

A whale is typically identified at first by a whale hunter on the sales team, but often requires cross-discipline participation in order to close; this includes assistance from operations, engineering, creative, client success, and business development teams.

"Shit...the sales director chewed me out on the sales call this morning. He's totally pissed that I have nothing in my pipeline. I've been focused on this one whale for so long that I haven't had time to prospect for normal-sized deals."

Whale by FQ_GFY February 3, 2020

Word of the Day on September 21, 2026

Concrete cowboy

A guy who thinks he's a country kinda guy, but in reality lives a comfortable city / suburban life.

Eugene: Look at that dude in the cowboy hat!
Todd: He's just a concrete cowboy.

Concrete cowboy by EugeneJohnson42000 March 16, 2024

Word of the Day on September 20, 2026

hobo loko

any hard liquor that is cheap & potent.. eg. relska, popov, potters, evan williams, kamchatka, fireball, rumpleminze, southern comfort, everclear

hey let's get a drink of that?

go ahead
*takes drink* ugh wtf is that?

everclear & bepsi
fucking hobo loko eeessshh

hobo loko by d i z k o 2 0 8 September 14, 2026

Word of the Day on September 19, 2026