Cloud Brain 

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.

Cloud Brain by masterblanket March 28, 2015

Brain Cloud 

A hangover that is so bad you can't even remember your phone number, pin number, etc.

I drank so much last night, I can't even remember where I parked. I've got some serious Brain Cloud today.

Brain Cloud by B2thaHizo August 6, 2008