Oxford English Dictionary Adds ‘Kewl’
By definition, it represents “an affected or exaggerated pronunciation of cool”.
The word first appeared as early as 1990, when used to describe music group Janes Addiction: “Janes Addiction is some kewl stuff”.
However, “kewl” is still regarded as slang, which means it still remains unacceptable in formal writing.
[via The Quick and Dirty]