I don't think it's considered to be impolite, but it is extremely informal. Its exact meaning most likely varies from person to person.
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CliveIn my experience, people learning English should be careful with this kind of slang, as they can often sound silly.Amen!
Unfortunately, I've had the experience of sounding silly, even when using a number of academic words.CliveIn my experience, people learning English should be careful with this kind of slang, as they can often sound silly.