Expletive is a grammatical construction that starts with words like it, here, and there. It does not contribute to the meaning of a sentence but serves to create emphasis.
literarydevices.net
Ok, this is NOT the expletive that I was thinking when I first selected it. Frankly it doesn’t seem like it will be as much fun either, but let’s give it a chance.
Here is the truth. The honest to god truth. I did not, could not kill the cat in the hat. Frankly he was much too fast and I much too fat.
— The Dog
Be well,
Monty’s Blahg 
I also never knew this alternate meaning of the word expletive. Interesting!
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Ah ha! A new way to look at expletives – now I’m going to go and think on this new input….
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