moonbrained 

A state of being unable to remember seemingly simple things such as keeping appointments and returning phone calls.

While occasionally a natural condition for some people, it is most often a temporary state triggered by excess stress and/or a lack of sleep. It should not be considered an accurate indicator of a person's intelligence.

I didn't mean to stand you up at the coffee shop last night. I got a bit moonbrained and completely forgot we had plans.

moonbrained by The Lord of Eltingville May 18, 2008

Moonbrain 

The term used to describe what long term drug use effects the brain. Which is leaving small crater like surfaces in the surface of the brain.

"yoooo we did so much dope this weekend it was firrreee."

" You have a moonbrain bro."

Moonbrain by Sxpientia January 7, 2016