Opacar=outshine ...
And "sacudir la polilla" (lit. "shake off the moths") means to dance...
Thus, it'd be something like this:
The difference between her and I is that when I dance I'm going to outshine her. Yes, I am going to outshine her with all the moths that I'll shake off with my first turn*.....
*meaning he reckons he's going to impress everyone from the moment he gets on the dance floor
-"reguero" is trail, it lit. says "with the trail of moths I'll cause"
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