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The action of someone telling another person that they'll do something in a situation. However, the other person listening to this promise may respond quickly by saying: "Manchest."

This word itself enforces that person who made the promise to literally complete, what they said they'd do.

If they don't complete their promised task to the word, "manchest," the person who said, manchest, may slap the other person in the chest due to their non compliance of their self made promise.

(Manchest does not apply for things someone might do, which they can say to prevent manchest from happening. For example: I ought to, should maybe, might, etc.).
Johnny: I'm gonna get that girl's snap soon, she has some rockin' tits.

Tommy: MANCHEST!

Johnny: Now wait a minute here fucko! I said "soon" that don't apply to my planned action. "Soon" means I'm planning on it, manchest don't count for that dumbass!

Tommy: Oh fine, whatever. . . Hey! What about that girl over there though?

Johnny: My God, I didn't even see her. . . I'm gonna talk to that one for sure then! Wow she's amazing!

Tommy: MANCHEST!

Johnny: ALRIGHT FINE, I'ma head over to her right now then, Tom. Getting slapped in the chest by Tommy, or talking to a gorgeous girl? I think I'ma go with the second one. . .

Tommy: You better do it or you finna get slapped in yo ribs! I'ma watch you! Good ol' manchest!
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by Sammy Trilla September 12, 2018
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Something that is said when another person half-assedly claims that they are going to do something. Calling out "man chest" will solidify that the original person has to what they had said they would do. Failure to follow through will result in a slap to the chest of the desired amount of brutality by the person who called "man chest." ~Originally used by La Costa Canyon and Ranch Bernardo High School Wrestling Teams.
Mike: "Ay yo faggots, I'm gonna slap this bitch's ass."
Brian: "Man chest, you maurk!"
by King of Half-Assery October 16, 2013
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