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1. kidney
Slang word from London used to describe something good or great. Similar effect to 'sick' or 'boss'
Mate, that was such a kidney night

This is track is so kidney
2. kidney
tha brain, intelligence
yo man, that nigga got a hell lotta kidneys.
3. kidney
a type of space cadet, usually Canadian that always daydreams and spazzes profusely; more formally known as sydney, but not the city in australia.
"she so pulled a kidney yesterday."
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