Rock brain

When you brain is as useful as a rock.

Man, after hitting that blunt I got mad rock brain.

by Gwilz November 05, 2018

rocks for brains

When someone has large rocks in place of an actual brain

"Panglou i can't believe you're that stupid, you have rocks for brains"

by RocksForBrains August 19, 2021

brain rock

When you think of something bad that happen to somebody and, it really happens to that person.

I through a brain rock at that guy, hoping he would fall, and... well he fell!

by Zabimaru555 December 15, 2008