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"
by Dr.Mighty February 5, 2010
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1.) The act of an intellectual person being so intoxicated, they do something so stupid as to make one question their intelligence.

(Keh-Tuhl-Ing)
I'm the Drunkest Girl in Camp!" "...What? -Ketilling

Kanye West totally pulled a Ketil! Well, not really, he was already a dumbass.

Eating Hordes of candy as a diabetic. -Ketilling
by BrackettE October 31, 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.
by Lix_DK March 25, 2022
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Ketil is a phrase used to define someone as gay or feminine
by Kukake June 27, 2017
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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
by Morendin123 June 8, 2022
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