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can you check me? 

when a girl asks a friend or s/o to look and see if she has period stains on her pants
-"hey can you check me?"
-"yeah, you're good"

can I take a rain check? 

means: that you do not want to accept an offer or suggestion but you might accept it at another time.
Annie: i was just calling to see if you wanted to have lunch tomorrow.
MAry: oh, I'm Sorry I have a meeting at that time, can I take a rain check?....

Your mouth is writing checks your ass can't cash

"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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