Green’s Dictionary of Slang

CK-one n.

[initial letters; a play on the perfume name CK-one (i.e. Calvin Klein One)]

(UK drugs) cocaine and ketamine; latterly crack cocaine and ketamine.

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[UK]Guardian Guide 27 Jan.–3 Feb. 28: About six months ago CK-one stopped meaning cock ’n’ ket and began meaning crack and ketamine.