Define Who Knows Meaning

Who Knows
How someone replies to a question when they don't give a shit enough about the answer to investigate.

Person 1: Why are you such a dick?
Person 2: Who knows.
By Trude
Who Knows
when you dont know who nutted inside you.

Brian: Did he nut inside you??

Linda: Who knowsss! its was crazy sex.

By Galina
Who Knows
I don't know, and I don't know anybody who does know. Despite being a question, this statement does not require a question mark.

Are they ever gonna release a new album?

Who knows.
By Allis
Those Who Know
When it comes to combat experience - those who know don't say - those who say don't know.

When it comes to combat experience - those who know don't say - those who say don't know.
By Jaquenetta
Can't Argue With Who Knows
Response to someone's statement of "who knows".

Kevin: "Wow, your son sure has his pick of colleges. Where do you think he'll end up?"
Billy: "Probably one of the Ivy Leagues. But who knows."
Kevin: "Can't argue with who knows."
By Antonia
Who Knows What Evil Lurks In The Hearts Of Men? The Shadow Knows!
1. The famous saying of the crime-fighting vigilante, The Shadow.

2. The introduction from The Shadow radio program "Who knows what evil lurks in the hearts of men? The Shadow knows!" spoken by actor Frank Readick Jr., has earned a place in the American idiom. These words were accompanied by an ominous laugh and a musical theme, Camille Saint-Saëns' Le Rouet d'Omphale ("Omphale's Spinning Wheel", composed in 1872). At the end of each episode The Shadow reminded listeners that, "The weed of crime bears bitter fruit. Crime does not pay... The Shadow knows!"

Source: 1.;

Powers/Abilities: The Shadow possesses incredible physical abilities. He possesses astonishing reflexes and is an incredible marksman with a gun. He also has incredible muscular control and can slip his body through the bars of a prison cell like a contortionist or can actually distort and alter his very facial features at will by manipulating his facial muscles. He can also survive for hours without air and was also ambidexterous. He is regarded as highly experienced in various disciplines of hand to hand combat as well.
His greatest power is his ability to “cloud men’s minds”. He can hypnotize people instantly so that he can move as an invisible shadow. He can also hypnotize people so they forget things or to command them to perform certain acts (he once forced a criminal to write a detailed account of his past crimes).He is an expert in many different languages and is also a master ventriloquist (he can project or “throw” his voice).
He is also a master of disguise and has been known to impersonate others, even fooling their friends and family members. The Shadow is apparently an expert aircraft pilot and skilled in infiltration and information gathering techniques due to his experience as an intelligence agent.
He wields a pair of .45 pistols and employs a fleet of automobiles and aircraft in his various operations.

"Who knows what evil lurks in the hearts of men? The Shadow knows!"
By Sophie
The name in the Harry Potter wizarding world for Lord Voldemort. He has also been called "He Who Must Not Be Named", "Lord Thingy", and other appellations of the sort.

Ron: "Hey, Hermione, I heard that You-Know-Who is trying to find Harry. D'you think he wants to kill him?"
By Selma
A person, usually an acquaintance, who you find completely detestable. The mere mention of their name is enough to fill you with a feeling of dread, while an encounter with this person inevitably leaves a cloud of misery hanging over an otherwise pleasant day. This term is derived from a common reference to Lord Voldemort from J.K. Rowling's Harry Potter series.

"I bumped into You-Know-Who the other day...that basically ruined my week."
By Coral
You Know Who
The Dark Lord, y'know, the one who doesen't have a kickass mace and a ring fetish...

"You know, I see the oppurtunity for a union here..." - Lord Voldemort (AKA "You Know Who", or "The Dark Lord") to Sauron (AKA "The Dark Lord") and Darth Vader (AKA "The Dark Lord")
By Gennie
You Know Who
Dick Trickle, a very unsuccessful NASCAR driver (in SportsCenter terminology). Probably started because his real name is too obscene to say on cable TV.

"Jeff Gordon won his third race this year, and you know who finished his best race of the season in 37th place." -ESPN anchor

Fred: "Doc, I think I caught an STD from this dirty whore I nailed last weekend."
Doc: "Hmmm...what are your symptoms?"
Fred: "I've got an itchy red rash, it burns when I pee, and I've got some real nasty you know who."
Doc: "Dick Trickle, eh? Yep, looks like a classic case ofherpegonnosyphiltitis to me. Bend over, we're gonna have to do a rectal examination."
Ricky Martin: "Giggidy giggidy!"
By Dominga