Chalk is one of the following.

1) A white or colored cylinder that you write on the chalkboard with. Some Chalk is used for sidewalks.

2) A powdery substance that you put on your hands when lifting heavy weights for extra friction.
3) 4F-MPH (4-Fluoromethylphenidate) that can be used as a study aid or to get high. Last a short to medium time like 2 to 4+ hours and is stronger than Cocaine, Crack, and Ritalin, but weaker than Blue Speed (Ethylamphetamine, Amphetamine). Chalk can be either snorted, smoked, or mixed with water and drank.

4) That blue stuff you put in the pool stick to shoot the white ball to hit the ball in the hole. Pool is a 2 player game, but you can practice on your own.
1) Ms Breeze: ok. Today we are going to write an essay. First take notes from the chalkboard and then read the article. *writes more stuff on the Chalkboard with chalk.

2) Stan: *puts powder on his hands
*lifts heavy weights
3) Tyler: You got any Chalk. Like you know, 4F-MPH.

Walter: Sure. I got a gram of Chalk. $30 dollars. *shows 4F-MPH.
Tyler: *pays Walter.

Tyler: measures 20mg Chalk (4F-MPH) on a scale, then mixes it with water and drinks it.

Tyler: This is a good study aid! I think I'll have a beer! *has a beer.

*4F-MPH plus ethanol becomes 4F-EPH (4-Fluoroethylphenidate).

Tyler: Now I feel high.
4) Fernando: *Puts Chalk on the pool stick. *Shoots pool ball
by CognitiveFuel March 14, 2023
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its used to describe the favorite, mostly in betting and gambling
the patriots have been the chalk in the NFL for several years
by pballman117 November 20, 2005
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The expected outcome, especially in a sporting event. Derived from, "you can chalk that up right now, we don't even have to see it."
My NCAA sweet sixteen bracket was chalk.
by Steven Borbash April 11, 2005
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At the start of intercourse you rub the tip of your penis on the women's vagina. Also spitting on it or licking fingers and rubbing on the tip to add moisture.
I was chalking it about to nail her and she stopped me and asked what her name was.
by big bend November 16, 2011
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Military term for an aircraft load. More specifically a group of airborne soldiers which deploy from a single aircraft or platoon sized unit for air-assault operations.
"I'm placing you in charge of chalk #4, soldier!"
by brokenmyth July 18, 2009
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(noun) A theory regarding a mystery. Refers to the practice of chalkboarding/whiteboarding ideas and expanding on them.
(verb) To actively theorize about said mysteries. Often used when someone is coming up with tinfoil theories.
"Man, so men and my friends were chalking about who Rey's parents might be..."

"Did you hear the chalk about Sylar and Peter Petrelli?"

"After those first teasers dropped, it was crazy how much chalk was flying around about what was going to happen in season 3 of Westworld."
by Rawnie Phen October 31, 2020
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