What means this expression " I rock at this job"
I saw this expression "As you can see, I rock at this job". But I don't know what this mean, I could think that "rock" in this case means that somebody apply perfect for something or is very good, but I'm not sure.

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Yep, it means you are very good - it's making a reference to something like "I am like a rock star" at this job

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Yes, if you 'rock at' something, it means you're very good at it.

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