Swain Brain 

When one pulls their nutsuck over the flacid shaft of their penis and says "THE BRAIN".

M.I. walks into the bathroom
B-Sweez follows him in with an awkward look in his eyes.
M.I. proceeds to urinate
B-Sweez unleashes the "Swain Brain"
M.I. turns around
B-Sweez yells "THE BRAIN!!"

Swain Brain by 207s finest April 27, 2010

Brain stain 

Information now in your head that you don’t want to be there.

Caitlyn Jenner’s performance on The Masked Singer left a brain stain.

Brain stain by La Vraie Princesse January 17, 2023

Brain Stain 

When something is stuck in your head, typically a song or tune/beat, that just won't go away like a bad stain.
See also "Ear Worm"

I've got brain stain from that song on the TV advert, I can't get it out of my head and I don't know the artist!

Brain Stain by oretisktick October 25, 2023

Brain Stain 

The act of holding your testicles in your hand, so that they resemble a brain. Then placing them on someone, thus giving them a brain stain.

I totally brain stained Johnny last night in his sleep.

Brain Stain by ClitorisCommander1234 June 7, 2011

brain stain 

the pesky mess left after someone's brain has splattered; usually left on purpose, out of anger and frustration

I'm so pissed at you, there's gonna be brain stains all over your shit when you get home!

brain stain by alyjane November 22, 2011

brain stain 

When a man nuts on your forehead.

Hey baby gimme a brain stain.

brain stain by AlecLEE41 July 30, 2022

spainbrain 

When a Spaniard does something only Spaniards do and it leads to everyone suffering.

Lau spainbrained in defense and we conceded another sloppy goal on FIFA.

Filip is such a spainbrain, he spent all his money on chorizo.

spainbrain by MikeRITE November 24, 2011