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Ketil is the state beyond perfect. While it is possible to prove that a system or something is perfect, Ketil can not be proved in the same way. This Ketil state only exists as a theory, since trying to measure such a ûber-perfect system will only bring it down to perfect. It was Albert Einstein which first came up with this theory during the second world war, and has later been accepted in most scientific circles, since it explains a lot of unknown phenomena.

Many opponents of the Ketil theory argue that it can not exist since it has never been measured, and that real scientists should not believe in such a God-like force.

Ketil was also used as a name before this theory, but the name became very popular after the Albert's über-perfect theory was published.
It is mostly used as a replacement word for the overused word perfect;
"Ah, this food was ketil!"

Or to describe the ultimate peace on earth;
"I think we should all live in peace and ketil"
ketil by Dr.Mighty February 5, 2010
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Ketil is a person with a very big penis.

The average length of the persons penis is around: 46 cm
Oh, see a Ketil over there, he has a very big penis, i want to do the dirty with him.
Ketil by Lix_DK March 25, 2022
Related Words
Ketil is a phrase used to define someone as gay or feminine
Ketil by Kukake June 27, 2017

Svein Ketil 

Svein Ketil is a very sexy boy, and he can get all the boys with big booty`s
Oooo is that Svein Ketil, ooh he got a fucking mega dick with some white stuff in it,shooting like a fucking heavy gun with very much huge large of white cum in your ass
Svein Ketil by Morendin123 June 8, 2022
The most beautiful name. There character is always good, sweet, just the best person to ever meet.
Ohh. Look at keti she is hot af.
keti by Yaaaas queen October 18, 2020

Katilsday 

A fictional new day supposedly invented by NBC to accommodate another night of the televised news magazine "Dateline", as claimed by the comedy show Family Guy.
Lois: I saw it on "Dateline Katilsday".
Peter: What the hell is Katilsday?
Lois: It's a new day NBC invented so they could have another "Dateline".
Katilsday by wizzy0807 February 20, 2011
Keilee is the sweetest girl you will ever find. She is a down to earth type of girl. She is very shy with people she doesn’t know but once she’s comfortable around you she is crazy! A Keilee always loves a good challenge. She is a special girl that everyone deserves to have. All she wishes is to be noticed and to fit in. She is very insecure even if there is no reason to. Let her know she is appreciated and loved. It’s all she truly seeks. A Keilee will love her partner unconditionally and will never give up on you unless you give up on her first.
Guy 1: She’s so sweet

Guy 2: Who?
Guy1: Keilee
Keilee by Anonymous2023 March 14, 2018