Top definition
The morning after a day of heavy weed smoking, where you can't focus on anything and your IQ drops 60 points.
Paul: Dude you drove the wrong way what were you thinking??
Danny: Sorry man I think I have cloud brain, I can't focus on anything.
by masterblanket March 28, 2015
Get the mug
Get a Cloud Brain mug for your bunkmate Nathalie.
buy the domain for your pet vlog