Fidelio means something and or someone, that is perfect; has no flaws, and is exceptionally excellent.
It is usually used in a formal setting denoting someone similar to a god.

Can also be used in a less formal sense meaning lovely, ethereal, and angelic.
“Wow… That girl chichi is perfect
I know right? She’s Fidelio.”
by CrimsonedClouds December 27, 2022
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To lick a man's asshole gently yet thoroughly.
I had just showered, so I asked her for fidelio, but she was uncomfortable with the idea.
by emilystartsfires October 7, 2015
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The male puts his testicles into the mouth of his partner and slaps the face
Pat and Devon enjoy a good French fidelio on a boring Sunday night
by Peepeesauce556 April 26, 2017
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