Brain block 

When one is lucid dreaming and your brain steps in and blocks it.

I was flying around and my brain blocked, so I woke up.

Brain block by Pavlovsdog May 29, 2021

black brain 

The loss of brain cells due to the excessive use of marijuana, resulting in getting stuck on a word or thought

Dude that girl was rambling on, def black brain

black brain by Janet flight August 31, 2017

brainlock 

When you drink and think at the same time and you repeat the same word over and over until you remember what you were talking about.

person 1: I was at the bar the other day and and and and and oh yea and i finally took a shot of tequila without throwing it back up.

person 2: wow. brainlock?

person 1: Dont judge me.

brainlock by jawbreakers and skittles October 9, 2010