Nails on a chalkboard 

(idiom) A sound that makes your ears bleed.

*plays an annoying song*

"This song is like nails on a chalkboard"

Nails on a chalkboard by ComputerLover May 4, 2020

Dirty Chalkboard 

While having anal sex, the man removes his penis and draggs it accross a white wall.

What's that brown line on the wall from? It's from the Dirty Chalkboard I did last night.

Dirty Chalkboard by Tom July 1, 2006

Chalkboard Club 

A club, usually underground at a school where people draw problems, incredible events, or stories out on a chalkboard and his co members help to solve them or entertain themselves from them.

We goin to Chalkboard Club today or what

Chalkboard Club by Caleb Michaels November 13, 2003

chalkboard 

(verb) To exaggerate tenuous or dubious connections, as Glenn Beck might with the aid of his chalkboard.

Man, Breitbart was really chalkboarding about Obama running Occupy!

chalkboard by emcro September 22, 2012

chalkboard 

Having sex with a black woman and ejaculating on her, preferably all over her back.

Dan could write his name, as well as complex calculus problems, on the ethiopian woman's body, making her into his very own chalkboard; Craig, however, had to stick to piss in the snow and geometry.

chalkboard by Jafaar November 9, 2006

The Chalkboard 

The chalkboard is a popular sex move where a black woman and a penis is needed. First the the penis is edged for use of semen then the black woman is strapped to a wall for easy access. Then as the penis is ejaculating it is used as a piece of chalk to write math equations on the black woman.

She didn’t want me to do the chalkboard but I didn’t take no for an answer.

The Chalkboard by Komodo Food July 10, 2023

Chalkboard 

A term used to secretly tell one person that another seems to have bigger boobs then usual

"Dude, that girl is chalkboard today!!!"
"I noticed!!!"

Chalkboard by pSeUdOnYmduhhhhh January 27, 2009