Any Clue What This Thick Coin Could Be

It's a fake for sure. Ancient coins did not have rims like yours does--those didn't appear until people started using machines to make coins. Roman coins were made by placing a heated flan (metal disc) on a reverse die fixed to an anvil, then hitting the obverse die onto the flan with a hammer. A human can't exert enough force in this manner to create a rim.

That said, I think your coin is trying to copy a coin of Augustus. I don't recognize the reverse, and I am having trouble making sense of the legend... "PENOI CAES OAV" / "VIAOLO NIAPATE" seems like gibberish to me

Probably some sort of fantasy piece made to be fixed into jewelry.

. Yes, it is a rather poor fake.

As for the design, I think it's trying and failing to resemble a Roman denarius depicting the set of sacrificial implements on the reverse, like this one of Nerva.

It's the sort of thing one might expect when making a modern copy from designs printed in an old book, rather than copying an actual coin.