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I would like to know if this phrase is considered rude. I know that it is informal, however today my boss got mad at me for using it. I work in a blue collar environment, and I have heard much worse things.
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Hi,

I would like to know if this phrase is considered rude. I know that it is informal, however today my boss got mad at me for using it. I work in a blue collar environment, and I have heard much worse things.

Generally speaking, this is not a wise thing to say to your boss. It sounds like you don't respect his authority.

It would sound a touch better if you added a small apology and a reason.

eg Sorry, I'll be there in a minute. I just have to finish performing open-heart surgery on this patient.

Best wishes, Clive