Top Definition
A person who is high on drugs 24/7.
I'm a legit cloud niner.
by skinnySinner January 13, 2015
Younger generation of tweekers who still have their looks and are classier than regular tweekers.
"You would never know by looking at her, that she smokes meth!" shouted Anna. "She's not a tweeker she's a cloud niner!" said Crystal. ;)
by Cloud9erz November 10, 2013

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