brain tuna 

a person who is as dumb as a tuna fish and has a big head

susan lee

brain tuna by lloyd checksfield February 9, 2004

Braintenance 

The act of cleaning out your brain of things that have been bouncing around in your thoughts for quite some time. This happens especially with relationships where you've gone awhile without actually deciding if you are into them anymore or not.

- Hey man, you wanna hang out this weekend?
- Naw bro, I gotta do some braintenance and figure out what the hell I'm doing.

Braintenance by jbird3030 June 20, 2016