"Your mouth is writing checks your ass can't cash," is something TV Dr. Phil McGraw's father said to him as a boy when he would voice wild plans or notions. It means that talk is cheap relative to performance, or that promising something and delivering on it are two different things. A phrase similar in meaning is "Money talks, bullshit walks."

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"I'm going to get a job selling fuzzy dice door-to-door. I'll be rich!"

"Boy, your mouth is writing checks your ass can't cash."

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by al-in-chgo March 13, 2010
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Stick to your word, and if you say something be able to prove/do it
Guy 1: I saw Madonna walking down the street yesterday . She had a corgi.
Guy 2: ight bet
Guy 1: *handover phone with pic of Madonna*
Guy 2: that picture is from the 80s! I'm not stupid.
Guy 1: no! I swear it's real!
Guy 2: looks up pictures of Madonna and find the same pic
Guy 1: oh... uh...
Guy 2:Don't let your mouth write a check that your ass can't cash!

Girl one: I could easily beat this game!
Girl 2: have a copy you can play
Girl one: what? I lost? How!? Ugh, I guess I was wrong.
Girl two: Don't let your mouth write a check that your ass can't cash
by PonianYoutube January 1, 2022
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