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When you're too chicken to speak up and say what you really want to say. You're scared of what might happen if you actually say it.
A: Uhm... are you sure you're not a potato? B: What? A: Never mind.
A: Uhm... I think I just peed my pants. B: You're not alone.
A: Uhm... that was the worst pizza I've ever eaten. B: Thanks, I was just about to say that.