Top Definition
Cloud up, to cloud up, or simply just cloud is to smoke a substance. The substance can range anywhere from bud to black star, depending on the region, but is usually in reference to Meth (again; depending on the region.)
Person 1 - You got shit?

Person 2 - Yeah, I cloud up.
ayon kay TakingDownVentus ika-26 ng Pebrero, 2013

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